Judith Alice Clark (born November 9, 1949), known as Judy Clark, is a US far-left radical activist, formerly a member of the Weather Underground and the May 19th Communist Organization (M19). Her mother was the researcher Ruth Clark. In 1967, she took up studies at the University of Chicago, where she joined Students for a Democratic Society (SDS) and later co-founded the Weather Underground, participating in the Days of Rage. She went underground, was arrested and briefly incarcerated; afterwards she lived in New York City, co-founding M19. In the early 1980s, M19 linked with the Black Liberation Army (BLA) as The Family in order to carry out bank robberies to support revolutionary struggle. Clark was arrested driving a getaway car after the October 1981 Brink's robbery in Nanuet, New York, in which a security guard and two Nyack, New York police officers were shot and killed.
At trial, she was sentenced three consecutive 25 to life terms for murder in the second degree, which she served at the Bedford Hills Correctional Facility in New York. Whilst incarcerated, she carried out HIV/AIDS activism, published in Social Justice, participated in a scheme to train service dogs for military veterans, assisted a chaplain and ran prenatal and infant support workshops for mothers. In 2016, Governor of New York Andrew Cuomo commuted her sentence to 35 years to life, making her eligible for parole. She was denied parole in 2017 and granted it in 2019.