Phillips was a member of various socio-political organizations and groups throughout his life. A strong supporter of labor struggles, he was a member of the Industrial Workers of the World (IWW), the International Union of Mine, Mill, and Smelter Workers (Mine Mill), and the Travelling Musician's Union AFM Local 1000. In solidarity with the poor, he was also an honorary member of Dignity Village, a homeless community. A pacifist, he was a member of Veterans for Peace and the Peace Center of Nevada County.