A Guilt by Association fallacy is grouping people together and then making a judgement on the group as a whole.
The character who used this fallacy in the film Twelve Angry Men was The Stockbroker.
The Stockbroker said “Slums are breeding ground for criminals”
The Stockbroker’s quote was a Guilt by Association because he is taking the fact of where the boy grew up and grouping him with others who have come out of this area. The Stockbroker is not looking at all the of the aspect of the boy's life but rather associating him with this group of people who could be doing illegal things. It doesn’t matter what he did or didn’t do but rather