In its long awaited decision in Mark Janus v. American Federation of State, County and Municipal Employees, the United States Supreme Court clearly and unequivocally held that it is a violation of public employees’ First Amendment rights to require that they pay an “agency fee” to the union that is their collective bargaining representative, to cover their “fair share” of their union representative’s bargaining and contract enforcement expenses. The Janus decision overturns the Court’s own 1977 decision in Abood v. Detroit Board of Education, which had found state and local laws requiring public sector employees to pay such fees to be lawful and constitutional. Commentators expect the decision to have serious economic consequences for unions in the heavily organized public sector.