Scum

see also: Anti-town

Scum is a catch-all term for any member of an informed minority, such as Serial Killers and Mafia goons. During a day phase, everybody is seemingly trying to locate and eliminate these roles.

It is typical to use the word scum as an adjective or other means as well. (i.e. That's a scummish thing to do. or You are acting quite scummy.)