After the huge protests in 2011 against Wisconsin's new collective bargaining restrictions, Gov. Scott Walker and his allies changed the rules at the state Capitol Building in Madison, requiring protesters to have permits. His reasoning? Um, none.

The Wisconsin Solidarity Singers had been gathering in the Capitol every day to protest the Walker agenda through song, and suddenly their gatherings were illegal. Singers started getting arrested. In response, hundreds of Wisconsinites joined their singing brethren to stand up to the ridiculousness of the arrests and the broader anti-worker Walker agenda.

Learn more about the Solidarity Singalong and read more intrepid reporting on the protests from John Nichols.