In 1970, guns belonging to Davis were used in an armed takeover of a courtroom in Marin County, California, in which four people were killed. Prosecuted for three capital felonies, including conspiracy to murder, she was held in jail for over a year before being acquitted of all charges in 1972. She visited Eastern Bloc countries in the 1970s and during the 1980s was twice the Communist Party's candidate for Vice President; at this time, she also held the position of professor of ethnic studies at San Francisco State University. Much of her work focused on the abolition of prisons and in 1997 she co-founded Critical Resistance, an organization working to abolish the prison–industrial complex. In 1991, amid the dissolution of the Soviet Union, she was part of a faction in the Communist Party that broke away to establish the CPUSA. Also in 1991, she joined the feminist studies department at the University of California, Santa Cruz, where she became department director before retiring in 2008. Since then she has continued to write and remained active in movements such as Occupy and the Boycott, Divestment and Sanctions campaign.