Conversation so far:
How did Danny Glover contribute to civil rights activism?
While attending San Francisco State University, Glover was a member of the Black Students' Union.
What did the Black Students' Union at SFSU accomplish?
The Black Students' Union at San Francisco State University started a five-month student-led strike to establish a Department of Black Studies.
What else did the student-led strike of San Francisco State University create besides the Department of Black Studies?
It helped create not only the first Department of Black Studies but also the first School of Ethnic Studies in the United States.
Did Danny Glover hold any jobs in activism?
Danny Glover's long history of union activism includes support for the United Farm Workers, UNITE HERE, and numerous service unions
What did people think regarding Danny Glover in activism?
Danny Glover was promoted to UN Goodwill Ambassador.

Question: What causes did he support?
Self-contained rewrite: What causes did Danny Glover support?