Cesar Chavez with George Moscone and McGovern Supporters

Cesar Chavez, co-founder of the United Farm Workers Union, with George Moscone and 'McGovern for President' supporters ("Grassroot McGoverners" in the language of the time) marching from the Civic Center to Union Square in San Francisco against Proposition 22 (which forbade secondary boycotts).
Fall 1972

For all 900 of IH's UFW photographs, see: The Farmworker Documentation Project