Throughout her career, Piven has combined academic work with political action. In 1968, she signed the "Writers and Editors War Tax Protest" pledge, vowing to refuse tax payments in protest against the Vietnam War. In 1983 she co-founded Human SERVE (Service Employees Registration and Voter Education), an organization with the goal of increasing voter registration by linking voter registration offerings with the use of social services or state Departments of Motor Vehicles. Human SERVE's initiative was incorporated by the National Voter Registration Act of 1993, colloquially known as the "Motor Voter Bill".