MADISON, Wis. — Police have arrested 30 people for singing without a permit inside the Wisconsin Capitol.

Tuesday marks the fourth week day out of the past five that people have been ticketed for gathering without the required permit in the Capitol.

There were no arrests Monday, as the usual people who sing songs lambasting Republicans and Gov. Scott Walker performed outside. Another group of conservatives obtained a permit to sing in the rotunda.

About 100 anti-Walker singers returned Tuesday and about 50 others observed.

Police have issued more than 120 tickets since last week to the singers, mostly for not having a permit.

The singers argue they don't need a permit to exercise their free speech rights. But a federal judge says a permit can be required for groups larger than 20.