Only if there's a predominent gang or more than one gang with sufficient numbers, otherwise something akin to a tcwn council would probably form out of the more level-headed people who realise that that things need to be done and resources need to be protected.
And even if it were ruled by a gang, it would still look like a normal, peaceful town. People would mostly behave themselves and there would be no need for it to be anything other than peaceful. Unless you're a rival gang member or do something to fuck off the gangs, they tend to leave you alone, especially if what you do is of use to their community.
A gang ruled town would not be a place of senseless random violence - gang violence may appear random, but there's generally a reason behind it. People would just go about their business and not give the gang a reason to trouble them.
On the surface it'd seem normal. Beneath the surface, a gang may be the ones making and enforcing the laws. They would want to ensure that resources get everywhere they need to be. OK, priority would be given to members (but in all seriousness, how does that differ from any municipal body that makes itself fat at the cost of the ratepayers?) but others would get a share as the gang will realise that they need "civilians" to do the work they can't (or don't want to) do.
My main point was that gangs have their codes of conduct by which members and non-members are expected to behave. The gang members might be OK with stealing from random "civilians" but stealing from each other is harshly punished within the gang, as is stealing from neighbours with whom they want to remain on amicable terms.
They might not give a fuck about the law of the land, but they are pragmatic and they certainly give a fuck about themselves and have rules/codes to protect their own best interests.
Your convicts would be no different in that respect, they may well think nothing about stealing from people in the towns they came from but they would not appreciate it happening to themselves and they would take steps to protect themselves in their new town. So they would make rules, appoint law-keepers and punish infractors.
While many may not like cops in general, how they react to that guy will depend on what he's like, who made him the cop in the town and many other factors including their personal outlooks.
I've seen an interview with a long-time professional thief whose attitude to the police was "it's nothing personal, it's their job to try to catch me" - the fact that he was being interviewed meant that he'd been caught at least once...
edited 8th Jan '13 7:59:47 PM by Wolf1066