In 1969, she was hired as an assistant professor of philosophy at the University of California, Los Angeles (UCLA). UCLA's governing Board of Regents soon fired her due to her membership in the CPUSA. After a court ruled the firing illegal, the university fired her for the use of inflammatory language. 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.
During the 1980s, Davis was twice the Communist Party's candidate for vice president. 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 broke away from the CPUSA to help establish the CCDS. That same year, she joined the feminist studies department at the University of California, Santa Cruz, where she became department director before retiring in 2008.