Abood v. Detroit Board of Education, 431 U.S. 209 (1977), is a US labor law case where the United States Supreme Court upheld the maintaining of a union shop in a public workplace. Public school teachers in Detroit had sought to overturn the requirement that they pay fees equivalent to union dues on the grounds that they opposed public sector collective bargaining and objected to the political activities of the union. In a unanimous decision, the Court affirmed that the union shop, legal in the private sector, is also legal in the public sector. They found that non-members may be assessed agency fees for to recover the costs of "collective bargaining, contract administration, and grievance adjustment purposes" while insisting that objectors to union membership or policy may not have their