MADISON, WI (AP) -

Police have arrested a prominent union leader during a protest in the Wisconsin Capitol rotunda.

Capitol Police arrested Wisconsin State Employees Union Executive Director Marty Beil shortly after the protest began on Wednesday, leading him away in handcuffs.

Protesters have been gathering in the rotunda almost every noon hour for more than two years to sing songs against Republican Gov. Scott Walker. The sing-alongs are a remnant of massive demonstrations at the Capitol in 2011 as lawmakers passed a Walker bill that stripped public works of their union rights.

Police launched a crackdown on the singers last month after a judge ruled police can require groups of more than 20 to get a permit to gather in the Capitol. They've made more than 300 arrests so far.