Celia Radosh (née Miller) was an Ashkenazi Jewish immigrant, born in 1900 in the Russian Empire, who immigrated to the United States as a child. She became a committed member of the Communist Party USA (CPUSA) after settling in New York City. Alongside her husband, Reuben Radosh, she immersed herself in leftist labor causes, reflecting the radical politics of many Jewish immigrants during that era. She was the mother of historian Ronald Radosh and raised him in an environment steeped in party ideology and activism. Throughout her life, until her death in 1990, she was actively involved in CPUSA activities, supporting workers' rights and socialist initiatives during the Great Depression and beyond. She participated in labor organizing efforts, likely influenced by the garment industry and union movements prevalent among immigrant communities in New York. Her dedication to communism profoundly shaped her family life, and her influence extended through her family, instilling communist values that later contrasted sharply with her son's eventual disillusionment with the movement. She remained loyal to her beliefs until her later years, embodying the personal sacrifices and unwavering commitment of many American communists during the Red Scare periods.