So, remember that storybook where the animals all teamed up to fight the bad guy in the forest? And they wore disguises so the bad guy didn't know who they were? Well, the Guerrilla Girls are kind of like that. They're a group of people who wear disguises to protect their identities, and they fight against unfairness and discrimination, especially when it comes to art and culture.
See, there are a lot of museums and galleries and art shows where only certain kinds of people get to show their art or be in charge. And the Guerrilla Girls think that's not fair. So they do things like make posters and billboards that show how unfair it is, and they put them up in public places where lots of people can see them. And they have cool names like "Frida Kahlo" and "Käthe Kollwitz" to cover up who they really are.
The Guerrilla Girls want to make everyone aware of this unfairness and to help change things so that anyone who wants to show their art or be in charge can do it, no matter who they are or what they look like. They're kind of like superheroes for artists and culture-lovers all over the world!