The Guerrilla Girls began in 1985. They chose to be anonymous, wearing gorilla masks for public appearances, and taking the names of deceased women artists. Their wanted to focus on discrimination issues in art, rather than themselves, as individual female artists.
Click here for a recent interview with some Guerrilla Girls on Late Night with Stephen Colbert. Notice the “name” tags.
One of their (several) fun slogans is “Fighting discrimination with facts, humour and fake fur!”