CHICAGO, IL – FEBRUARY 26: Members of the Service Employees International Union (SEIU) hold a rally in support of the American Federation of State County and Municipal Employees (AFSCME) union at the Richard J. Daley Center plaza on February 26, 2018 in Chicago, Illinois. Today the U.S. Supreme Court is hearing arguments in Janus v. AFSCME, a lawsuit that challenges unions’ authority under state law to collect compulsory fees from all employees they serve. (Photo by Scott Olson/Getty Images)