DETROIT (AP) — A Ronald McDonald look-alike and a prison-garbed masked man, both holding money bags, joined a crowd of protesters Tuesday outside a McDonald’s restaurant in Detroit where workers say they were shorted on their pay.

The morning event was part of an effort in 33 U.S. cities to spotlight what organizers say are practices that deprive fast-food workers of their wages. The protest grows out of an ongoing campaign to raise wages to $15 an hour and promote the rights of low-wage workers.