This collection consists mostly of materials gathered by Ron Lopez for his research into the Sleepy Lagoon murder case. Primary documents include statements and correspondence from various groups advocating for the rights of the defendants. Secondary documents include clippings and scholarly articles on the trials and the Zoot Suit Riots. There is also material from the 1920s-1930s and 1960s-1970s about the condition of Mexican Americans more generally. Virtually everything in the collection is a photocopy.