Terry stumbling up to the hiring boss at the docks after a vicious beatdown by Friendly's goons, refusing to stay intimidated, and demanding that he go in for work that day despite the likelihood he won't be able to stand another minute. When the rest of the workers insist they won't go to work without him, the boss relents.
The closing shot of Friendly, screaming death threats at every worker who now ignores him as they walk past, demonstrating how nobody on the waterfront fears him anymore.
A meta example for Marlon Brando. His performance as Terry is considered by critics as one of the greatest in film history.