Baldo Loy worked for the Pacific Steamship Association as a Stevedore in 1923 and for the Moore Drydock Company in 1924. By 1935, he was a member of the Industrial Union of Marine and Shipbuilding Workers of America, Local 9. He was "granted Honorable, withdrawel [sic] from this Local" on 26 January 1936. That same year, at the age of 36, he was issued a picket card by the Maritime Federation of the Pacific coast, serving the organization faithfully during the Maritime Federation Pacific Coast strike. The collection consists of picket cards and other forms of identification relating to Baldo Loy's union affiliations.