russian mafiya basically started in prison aka the gulags.
Vory v zakone. Very interesting stuff, and the "bitch wars" - the old vor vs the new vor who agreed to participate in Penal Battalions for Stalin during WW2, and then got sent back to the Gulags anyway.
-I shot him a coupla' times. -What's a couple? -Hmm, more than a couple... Really I don't know the exact amount, maybe I shot him 10 times, 12 times? -Maybe fifteen? -Hmm, it could've been fifteen...