Who were the Guerrilla Girls and what was their mission?

What will be an ideal response?

The Guerrilla Girls came into being in 1985 shortly after the opening of a huge exhibition at New York's Museum of Modern Art. The exhibition was a survey of contemporary painting and sculpture, and fewer than 10 percent of the works were by women artists. This event sparked the actions of an anonymous group of women artists who, in various methods and forms, protested the lack of women artists exhibiting in museums. Their protests ranged from posters to city bus signs. Eventually they began to appear in person, wearing gorilla masks that served a double purpose: to protect the identities of the protestors and to put everyone else at a disadvantage of being confronted with a ferocious apelike face. Individually the women artists may lack clout, but together they are powerful, and they believed the first step toward making a change is getting attention.