For two decades, Schulz was a key leader of the revolutionary socialist movement in Canada. Schulz joined the
Co-operative Commonwealth Federation in 1952, at age 18. She was attracted to the left wing of the party.
Ian Angus recalls: 'Not long after joining, a CCF member tried to warn her against collaborating with a certain party member because that person was a member of the Revolutionary Workers Party. She said the warning didn't have the intended effect... "I thought, Wow! Not just a workers’ party, but a revolutionary workers’ party. I had to meet those people." The Revolutionary Workers Party, founded in 1946, was the Canadian section of the
Fourth International, the worldwide Trotskyist movement. In 1954, the Ontario CCF expelled all Trotskyist members, including Schulz. From 1954 to 1974, she was a member and leader first of the Socialist Education League and later the League for Socialist Action-Ligue Socialiste Ouvriere (LSA-LSO). The LSA-LSO was one of the predecessor organizations of the Revolutionary Workers League (RWL). One of Schulz’s first projects was the 1955 launching of the Canadian edition of
Workers Vanguard, a newspaper to which she was a regular contributor. In 1964 Schulz ran for the position of
Toronto city council controller as the LSA-LSO candidate. That same year, Schulz was part of an all-women team that traveled throughout Ontario in a half-ton truck selling s subscriptions to Workers Vanguard. They were called "The Trailblazers" and they went to plant and factory gates and door-to-door, selling the newspaper. == Desegregating the Palais Royale ==