In 1985, a group of anonymous female artists in New York began dressing up with gorilla masks on their heads and putting up fly-posters around the city's museums and galleries. It was part of a campaign to demand greater representation for women and ethnic minorities in the art world. The guerrilla girls' campaign later went international. Laura Fitzpatrick has been talking to the activists known as "Frida Kahlo" and "Kathe Kollowitz".

PHOTO: Some of the Guerrilla Girls in 1990 (Getty Images)