As the title said, make the Hell's Angels, the biker gang, have a big presence in an dictatorship. Bonus points if it is a communist state, more bonus points if it is Soviet.
Outlaw motorcycle gangs would 'work' best in Rightist dictatorships in Latin America, I suppose.
Or Peron's Argentina. Possibly a non-communist Castro Cuba--though they'd have to use non-warranty spares on their Hogs if there's still an embargo!