Under his counsel and leadership, AJCongress was often in the courts challenging discrimination and advocating civil rights. Maslow created the AJCongress’ Commission on Law and Social Action and with it, filed a discrimination suit against Columbia University, demanding that it change its discriminatory admissions quotas. He also filed a suite against Stuyvesant Town Housing Co. because of its racial policies against black tenants.
In 1947, he fought for strict adherence to the Ives-Quinn Law which forbade discrimination in employment, charging that job agencies were disregarding this law en masse, 88% in fact He negotiated with Gertz, a department store in Jamaica, Queens, to hire blacks for the first time. "The negroes' fight against discrimination in employment, housing, education is part of the struggle for Jews for equality of opportunity in those fields."
Maslow helped organize Dr. Martin Luther King Jr.'s 1968 civil rights march on Washington, D.C. and the Little Rock school discrimination case in the 1950s.