The branch of the Mafia that follows Communist, Marxist, Calvinist, Maoist, or other types of communal living ideals.
After storming the Winter Palace, the socialist mob rubbed out several royals by dismembering them and distributing the body parts equally among their families.
Mob Fest is when a large group of people, drunk or intoxicated are at a concert with violent intentions.
I just went to this Justin Bieber concert, it was such a Mob Fest