1) Key thinker - Stirner - individualist anarchism (egoism)
2) Key thinker - Kropotkin (collectivist anarchism)
3) Key thinker - Bakunin (collectivist)
4) Key thinker - Proudhon - ‘property is theft’ - bridge between collectivist and individualist anarchism
5) Key thinker - Goldman- preached assassination as a valid anarchist technique (anarcho-feminist)