As expected, the labor/management struggle up at Camden Yards is getting uglier.

Last weekend’s protest against the underpaying of the workers who clean up Oriole Park after ballgames drew an estimated 400 marchers. This was the first of a series of events planned for this summer by the United Workers Association, which has been fighting for three years to get the cleanup crew a living wage.

A day after the march, Next Day Staffing—-the Baltimore employment agency contracted by the Maryland Stadium Authority, which owns the O’s home coliseum, to hire the cleaners—-went to court seeking to prevent UWA officials from recruiting workers to the fight on stadium grounds on game days or nights. (Todd Cherkis, brother of City Paper‘s Jason Cherkis, is a UWA organizer.)

UWA brass alleges that the protesting workers were threatened by a Next Day staffer wielding, appropriately enough, a baseball bat.