Mark Janus, the state worker who had a recent victory at the Supreme Court, is joining the group that oversaw his case.

Janus is joining the conservative leaning Illinois Policy Institute and its Liberty Justice Center as a “senior fellow.”

Janus argued against a 41-year-old ruling that had allowed states to require public employees to pay some fees to unions that represent them, even if the workers chose not to join. He said unions are political and employees shouldn’t be forced to pay.