Responsible for roughly 1/4 of prison murders in the United States, if you want to be a member of this gang, you must kill or assault a fellow prisoner. It is a practice known as “blood in, blood out,” so anyone who tries to leave the gang usually ends up dead or in the hospital as well. These gang members are responsible for male prostitution rings, gambling, and extortion inside prison walls, and just about every possible criminal behavior outside of prison.