Collection comprises 15 black and white photographic prints and two photocopies of the front and back of a photographic print documenting Dorothy De Losada's work as a political and union activist between 1946 and 1956. The bulk of the photographs show De Losada's and the International Longshore and Warehouse Union's (ILWU) picketing of the Hiram Walker liquor rectifying plant between 1948-1949 and the assembly line at Hiram Walker in 1956. Photographs also document De Losada's time in Monteagle, Tennessee as a teacher at the Highlander Folk School and show her posed with students of her labor history class. There is a photograph of De Losada watching American chemist and peace activist Linus Pauling speaking at a 1949 Peace Conference in Mexico City (Pauling is not pictured). Photographs also show an ILWU Strike Publicity Committee meeting in San Francisco in May 1947; a picket line against discrimination held at Fillmore and Eddy Streets, San Francisco, November 1948; and an ILWU strike in 1949. Two photocopies are copies of the front and back of a photograph depicting Horace De Losada (Dorothy De Losada's husband) addressing the Joint Action Committee of Maritime Unions at Embarcadero and Commercial Streets in San Francisco, June 1948.