Arn Tellem, one of the N.B.A.’s most powerful player agents, is calling for the ouster of the union chief Billy Hunter, a step he is urging his clients to take next month during the annual players’ meeting at the league’s All-Star weekend in Houston.

Using stark, unambiguous terms, Tellem outlined his position in a 1,500-word letter sent to his players Monday night. In the letter, which was obtained by The New York Times, Tellem blasts Hunter’s record as executive director of the National Basketball Players Association and accuses him of using the union for personal gain.

The letter comes two weeks after the release of an outside audit that heavily criticized Hunter’s hiring practices and expenditures and questioned his judgment on a wide array of issues.

“N.B.A. players deserve better representation from the union they fund,” Tellem wrote in the letter. “I implore you and your fellow players to take control of your union and your future. It’s time for Mr. Hunter to go.”