(January 16, 2018, 12:36 PM EST) -- WASHINGTON, D.C. — Mandatory public-sector agency fees for employees who choose not to join a union where the fees are used to support collective bargaining, contract administration and grievance adjustment are constitutionally sound, respondents in an agency fee appeal before the U.S. Supreme Court argue in two separate briefs filed Jan. 12 (Mark Janus v. American Federation of State, County, and Municipal Employees, Council 31, et al., No. 16-1466, U.S. Sup.)....