A pair of Am Law 100 firms are advising separate sides in a dispute over wages between the U.S. women’s national hockey team and USA Hockey Inc.

Ballard Spahr has taken a lead role advising the women’s team, the latest torch bearers in a fight over equitable compensation in sports, as they threatened Wednesday a boycott on their participation in a major tournament later this month after a year of stalled negotiations over increased wages and support from the sport’s U.S. governing body.