Can a private organization force someone to pay them to speak on his or her behalf? That's the question before the U.S. Supreme Court as it hears oral arguments in Janus v. AFSCME on Monday, February 26. The case may well mean the end of mandatory dues under agency shop agreements, the major source of funds for public employee unions, including the teachers' unions which have a stranglehold on the nation's public schools. This week's guest on Reality Check with Jeanne Allen is Mark Mix, President of the National Right to Work Legal Defense Foundation, which represents Mark Janus, the plaintiff in the case. Learn all about one of the most important Supreme Court cases of the year on this edition of Reality Check.