Those who believe that all minorities are discriminated against. Basically if you're a white, heterosexual male then you should be ashamed of yourself.
Lefty Scum types can invariably be found at Universities where they can hide behind a cloak of political-correctness and perceived moral superiority.
Lefty scum typically confine their studies to those in the Arts faculty (e.g. Anthropology, Womens Studies etc) writing a thesis that in their grandiose minds will ultimately change the world (in reality no-one will even read it). Anyone who challenges their views are instantly branded a phobic of some sort. The same lefty scum who preach values such as acceptance, tolerance and egalitarianism paradoxically are the first people to point the finger and ostracise those who dare oppose their views.
The physical appearance of lefty scum can best be described as grubby. Any attempt to make oneself more appealing to the opposite sex, however minor, is frowned upon. Therefore hairy armpits, dreadlocks and lack of bras (in the case of female lefty scum) and general lack of personal hygeine are standard for the lefty scum individual. Lefty scum are also the major worldwide consumers of corduroy, typically purchased from their local op-shop with money obtained either through government benefits or by fire-twirling buskering.
Normal person: Aborigines make up less than 2% of the general population and yet comprise almost half of the entire prison population.
Lefty Scum: That's stereotyping my friend, you should be careful making statements like that.
Normal person: NO DICKHEAD, ITS A FACT. AND I'M NOT YOUR FRIEND YOU USELESS FUCKING OXYGEN THIEF.
(Normal person stabs lefty scum with a rusty steak knife).