This collection consists of Ralph Arriola's collection of photographs, clippings, ephemera, and books. The predominant subject of the material is the Chicano Moratorium that occurred on August 29, 1970. The Chicano Moratorium, previously called the National Chicano Moratorium Committee, was a Los Angeles-founded organized movement of Chicano and Mexican-American activists who opposed the Vietnam War. The Chicano Moratorium activists were mainly students from Los Angeles colleges and high schools. They organized walkouts and protests from 1968 through 1970. The August 29, 1970 march was held in East Los Angeles and drew 30,000 participants.

Other subjects include Ruben Salazer, Robert F. Kennedy, Cesar E. Chavez, United Farm Workers, United Auto and Workers. The collection also includes some rare small press Chicano and Latino themed newspapers mainly published between the late 1960s through the mid 1970s, including La Raza, El Malcriado, and El Travieso.