A key part of the punk culture. Most true punks, no matter where they come from, would stand up for brethren in time of need. Its the feeling of being a minority in a place that hates you, you cling to people like you and form a bond almost as close as love. I listen to street punk
, my friends listen to crust punk
....we have differences but if some prep or cop tried to start a problem, they know ive got their backs as well as they have mine. Im not personally sure where it started, im sure if you asked an old punk they'd tell you, all I know is I won't let it die.