Clinton Jencks (March 1, 1918 – December 15, 2005) was an American lifelong activist in labor and social justice causes, most famous for union organizing among New Mexico's miners, acting in the 1954 film Salt of the Earth (where he portrayed "Frank Barnes", a character based on himself), and enduring years of government prosecution (and persecution) for allegedly falsifying a Taft-Hartley non-communist affidavit.