The NCAA is supporting Dartmouth College in its attempt to prevent men’s basketball players from forming a union.

On Thursday, the NCAA filed an amicus brief with the National Labor Relations Board, expressing support for Dartmouth’s appeal of a decision that men’s basketball players are university employees who can unionize. The Ivy League filed a similar brief in April.

The Dartmouth men’s basketball team filed a petition to unionize in September 2023, and the NLRB ruled in February that the players could proceed.