There is always that one teacher, the one who is always bringing his or her politics into the classroom and is extremely passionate about it. Be it about religion, the government, or ethics, morality, and values, this teacher is always ready with their own arguments and/or long-winded speeches. Typically, this person teaches a class involving social sciences (e.g.: history, sociology, politics), but it can be any teacher in any subject. College professors are even more likely to be politically motivated.
The Politically Motivated Teacher can be portrayed either as a positive or a negative thing, generally depending on whether or not the teacher's views align with the author's. If it's shown in a positive way, then the teacher will often stimulate intelligent debate, helping his or her students to think more critically about the events in the world around them and get more involved in society. If it's shown negatively, the teacher will run the classroom with an iron fist and punish students who voice dissenting political views instead of promoting discussion. Either way, expect anvils to be dropped like a bowling ball tied to a weak tree branch.
A Hippie Teacher can be related, for reasons of hippies being very politically radical. The negative version of this trope often takes the form of a Sadist Teacher with Strawman Political elements, while a positive version is usually a Reasonable Authority Figure.
This trope is definitely Truth in Television, as any college students (and sometimes high school students) can attest to. The political alignment of these teachers often correspond with the general atmosphere of the school in which they teach, though there are without a doubt many who go against the grain of their institution's political philosophies.
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Clueless has Miss Geist, who wants to inspire her students to save the environment and aid disaster victims. She's portrayed as dorky, but likable.
The teacher obsessed with Vietnam in Back to School brings a certain kind of psychotic passion to his classes.
"Mr. Tergeson's really committed. In fact, I think he was."
Mr. Keating from Dead Poets Society spends more time spouting Romantic and Transcendentalist ideals in his class than actually teaching.
Then again, he is a literature teacher, so that comes with the territory. The trope is actually subverted because Keating arouses the ire of parents and administrators for actually realizing what it was he was teaching and doing so effectively.
The Women's Studies professor from Sorority Boys is a terrifying example of a Straw Feminist. Among the lecture topics in her class is the "Myth of the Male Orgasm," prompting a confused look from Dave, the only male in the class.
The Prime of Miss Jean Brodie is a negatively-slanted Trope Codifier. She's overtly sympathetic to Mussolini and Francisco Franco, an ideology that turns her classroom into self-centered personality cult. Her teachings warp her charges to the point where one girl goes to fight in the Spanish Civil War and dies. She's pointedly called out on this at film's end.
Justified in Robert A. Heinlein's Starship Troopers. The History and Moral Philosophy class every student is required to take attempts to implant pro-military beliefs and encourage joining the Federal Service, so the teachers — all retired veterans, by law — naturally push these political and philosophical values on their students.
In StarshipTroopers, he puts his money where his mouth is, resuming his commission with the Mobile Infantry.
HMP instructors are very focused on exposing their students to this philosophy and belief, but as is explicitly pointed out, you can't fail and there are no penalties for either sleeping through the course or passionately disagreeing with every word being stated.
A similar example is Kantorek in All Quiet on the Western Front, who encourages his students to join the German army in World War I, greatly romanticizing it as something glorious.Of course, he couldn't be farther from the truth. One of Kantorek's former students gets payback when he becomes his commanding officer. He reminds Kantorek of a fellow student who died in agony after joining the frontlines thanks to Kantorek's speeches and makes Kantorek follow humiliating orders.
Professor Dillamond in Wicked is extremely passionate about his beliefs about the prejudice againsttalking animalsin the school system and his fears about what is happening to them, fears which turn out to be correct. This has a profound effect on Elphaba, particularly because of the prejudice against her for her green skin.
The eponymous subject of Tuesdays with Morrie, Morrie Schwartz, was said to have been very much an activist, even giving his students all A grades to prevent them from being drafted.
An interesting subversion in Avi's Nothing But the Truth, in which everyone except the teacher (and the student that the book focuses on) has an agenda.
Bill's old writing professor in It is a negative example. He cared more about pushing a liberal agenda than about teaching his students how to write good stories. He failed Bill out of his class solely because Bill challenged his attempts to make everything about politics. Bill's final "screw you" to his old professor was to send him a copy of a magazine that liked one of Bill's stories and published it.
In Speak, Melinda's teacher Mr. Neck likes to rant about various political topics, such as how illegal aliens are stealing jobs from hardworking Americans.
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Square Pegs had a Vietnam veteran turned football coach who obsessively compared every event on the football field to Vietnam, and blamed the team's defeat on the treacherous liberal media.
One episode of Bronx Zoo had a science teacher become a born-again Christian after surviving an accident where a cross-shaped beam narrowly missed falling on him. He become convinced the Bible was the literal word of God and started teaching creationism rather than evolution in his class.
Not exactly a teacher, but in The George Lopez Show, Max's Treetop Rangers leader liked to rant about how recycling is bad and how cops should be allowed to profile Mexicans. When Max's dad George confronts him, saying that he is Mexican, he says "Oh, not like you. I mean one of those 'Me no speakee' Mexicans."
In the early arcs of Better Days Fisk had to deal with a particularly anvilicious liberal social studies teacher.
South Park's Mr. (or Mrs.) Garrison has been known to do this on occasion, though less blatantly, as it's often left to offhand comments (such as in South Park: Bigger, Longer & Uncut when he declared the Mothers Against Canada were "probably just all on their periods"). In "Follow That Egg!," however, (s)he manipulates the lesson in a ploy to keep gay marriage illegal (though his/her motivation is more personal than political). (S)he does the same thing when it comes to teaching evolution (first being vehemently opposed to it as a creationist, then switching to being vehemently anti-religion). (S)he explains that her/his only consistent belief is that you have to be an asshole to anyone who disagrees with you.
The Fire Nation schools in Avatar: The Last Airbender are staffed entirely with these sorts of teachers, whose lessons all carry a heavy undercurrent about how wonderful their country is and how their imperialism is for the good of the world. This has less to do with the teachers themselves and more the Fire Nation seeing that these values are imparted to the younger generation. Since the Fire Nation has been in this state for a hundred years, it's likely the school was like this before the current faculties were ever old enough to attend.
Andrew Schlafly, creator of Conservapedia, is a teacher who greatly encourages his students to use his website for research. The site is pretty up-front about having a strong conservative bias (the idea being that it is opposite to the purportedly liberalWikipedia). The site itself is, against his wishes, practically a parody of itself due to the number of Trolls who've infiltrated it.
There was a kerfuffle a few years ago when a high school history teacher named Jay Bennish was recorded going on an explosive political tirade comparing the style of George W. Bush's State of the Union address to Adolf Hitler (remember, this was history, not current affairs), and was suspended as a result. Bennish claimed he was trying to get his students to "think more in-depth," an explanation that didn't really gel with the nature of his rant.
In the United States, universities are often accused by conservatives of being centers of liberal indoctrination. To be fair, there are numerous studies that come out in which the college's liberal-leaning teachers outnumber the conservatives by absurd numbers.
Conservatives generally view the entire (K-12 public) education system in the United States as liberally biased - arguably justified in that between 1989-2012, the American Federation of Teachers gave $33 million to Democrats. In the same period, they gave $0 to Republicans.
Which some people think can be explained with the idea that for a conservative academic, there are much better options than becoming a university professor, mainly in the numerous conservative think tanks.
Some argue that the reason so many conservative think tanks exist in the first place is due to conservatives being driven out of universities.
OR could be explained by Republicans tending to cut funding for education and thus harming teacher's wages, or because teachers are heavily unionized, which runs against the grain of Republicans more hands-off free market ideas, so really it is just a vicious cycle.
And another option is that conservatives will, generally speaking, prefer going into private industry than public ones, while liberals are the opposite. And the flipside is that those in public service may develop a liberal mindset due to their interacting with more diverse groups than those in private businesses would.
A North Carolina teacher named Tanya Dixon-Neely was suspended in 2012 for her screaming tirade against one of her high school students in which she claimed that the student was not allowed to "disrespect" President Obama. One of her students was recording the rant because Dixon-Neely apparently had a history of anti-conservative behavior.
Lynette Gaymon, a Philadelphia high school geometry teacher, publicly bullied and humiliated a student for wearing a "Romney/Ryan" t-shirt in class. Gaymon claimed the school was "Democratic" and compared it to wearing a "KKK shirt". The teacher's harassment continued until the student had to leave school, at which point the student and her parents were harassed by other students and had obscenities shouted at them as they left.
There have even been accusations of this against non-totalitarian education, citing the Bleached Underpants version of events taught to children in history classes (the story of Thanksgiving in the US being a big one).
Ward Churchill is one of the more infamous real life examples. Although to his credit he was an ethnic studies college professor. He just took being outspoken and opinionated to whole new levels
Especially in the American Deep South, it's not hard to find history teachers who are very adamant about making sure their students know that the American Civil War was also/mostly about other issues than simply banning or keeping slavery, usually mentioning how the North was very Federalist (strong central government and pan-US-nationalism) whereas the South was very Anti-Federalist (weak central government, strong individual state-government and state-nationalism.) To their credit, there were multiple issues at play that led to the American Civil War, and some are honestly simply trying to let them know that it was much more complex than the modern reading of "North says slavery bad; South says slavery good, Round 1: FIGHT!" but more than a few simply take it too far.
A good example of this is that Confederate apologists will focus on Sherman's March to the Sea while ignoring the war crimes of Nathan Bedford Forrest and William Quantrill. Likewise, Robert E. Lee is painted as a paragon of virtue and Ulysses S. Grant as an immoral drunk. Slavery is treated as a tangential question to the real issue of States' Rights, and any statements to the contrary are ignored, such as Alexander Stephen's "Cornerstone Speech," which proclaimed that the foundation of the Confederacy was slavery.