Adam Allington / St. Louis Public Radio

Adversaries in the contentious pro football labor battle convened in a Federal Appeals Court in St. Louis on Friday.

The National Football League is appealing an April injunction from a Minnesota Judge that temporarily lifted the lockout.

The NFL Players Association is in the process of suing the league, claiming that the lockout in violation of federal anti-trust laws.

Paul Clement is an attorney for the NFL team owners; he told a three-judge panel that the issue before them is one for labor laws to decide.