Harry Hay was an advocate of statutory rape and the widely acknowledged founder and and progenitor of the activist homosexual agenda in the United States. Hay joined the Communist Party of the United States (CPUSA) in 1934. 
Born Henry Hay, from 1936 to 1938 he worked on the End Poverty in California campaign, the Hollywood Writers’ Mobilization, the American League Against War and Fascism, the Mobilization for Democracy, the Workers’ Alliance of America and Labor’s Non-Partisan League. 
The original founders of the Mattachine Foundation were all either former CPUSA members or fellow travelers. The first step Hay took in organizing the Mattachine Foundation was to recommend to the CPUSA that he be expelled in 1951 after eighteen years as a member. Rather than do that in light of his years of service to the party and work as a teacher at the California Labor School,  they released him as “a security risk but a life-long friend of the people.” The early leadership of the Foundation shaped the organization to reflect the cell structure of the Communist Party, in which "secrecy, hierarchical structures, and centralized leadership predominated."  Hay and his comrades took began circulating the USSR and the East European Communist parties sponsored anti-war Stockholm Peace petition against the Korean War  at a gay beach in Los Angeles. Some of the contacts they gained in this way were later organized into their first study and discussion groups. The first months produced hundreds of members.
Hay was a regular speaker at NAMBLA Conferences and NAMBLA continues to carry a special tribute to Hay on its homepage along with his published material. Hay was known for making public statements to justify sexual abuse of minors. In 1983 Hay addressed a NAMBLA conference in New York Hay said,
|“||Because if the parents and friends of gays are truly friends of gays, they would know from their gay kids that the relationship with an older man is precisely what thirteen-, fourteen-, and fifteen-year-old kids need more than anything else in the world. ||”|
- The Boston Phoenix, The real Harry Hay, Michael Bronski, October 31 - November 7, 2002.
- Harry Hay heard ‘siren song of revolution’, Leslie Feinberg, Workers World, Apr 20, 2005.
- In Partial Payment Class Struggle, Sexuality and Gay Liberation (1978), by A. Rausch. Retrieved from Urgent Tasks: Journal of the Revolutionary Left, Sojourner Truth Organization Digital Archive , 10 May 2007.
- John D'Emilio, Sexual Politics, Sexual Communities: The Making of a Homosexual Minority in the United States (Chicago: University of Chicago Press, 1983), quoted in Martin Meeker, Behind the Mask of Respectability, Journal of the History of Sexuality, (2001) 78-116.
- New Russian Evidence on the Korean War Biological Warfare Allegations: Background and Analysis,Milton Leitenberg, Cold War International History Project, Woodrow Wilson International Center for Scholars.
- The American Spectator Special Report, When Nancy Met Harry, Jeffrey Lord, 10/5/2006.