|Part of a series on| Black feminism argues that sexism, class
oppression, and racism are inextricably bound together. The way
these relate to each other is called intersectionality. Forms of
feminism that strive to overcome sexism and class oppression but
ignore race can discriminate against many people, including
women, through racial bias. The Combahee River Collective argued
in 1974 that the liberation of black women entails freedom for
all people, since it would require the end of racism, sexism,
and class oppression. One of the theories that evolved out of
the Black feminist movement was Alice Walker's Womanism. Alice
Walker and other womanists pointed out that black women
experienced a different and more intense kind of oppression from
that of white women. They point to the emergence black feminism
after earlier movements led by white middle-class women which
they regard as having largely ignored oppression based on race
and class. Patricia Hill Collins defined Black feminism, in
Black Feminist Thought