Several University of Michigan students are protesting the school's sweatshop labor policies.
Dozens are wearing sandwich boards Thursday hoping to spread their message throughout campus.
The students want the administration to look into alleged unfair conditions at its apparel manufacturing sites.
Demonstrators say they will not stop until the situation changes.
"We are gonna be here all day, all night and we are gonna be here until something happens, until justice is served," said a protesting student.
Police arrested a dozen of the protesters Wednesday, after they refused to leave the president's office.
They have since been released.