Three people participating in a New York City protest against Walmart have been taken into police custody.

About 20 employees, former employees and supporters gathered Thursday outside a Manhattan building where a member of the company’s board of directors has an office. They delivered a petition calling for improved working conditions and reinstatement of workers they say were fired for engaging in labor activities.

Police say one man and two women were charged with disorderly conduct for blocking the entrance to the building and trespassing.

WalMart Stores Inc. is based in Bentonville, Ark. It calls the New York protest “a show” put on by union activists from other states. It says in a statement the “vast majority” of its workers don’t share the opinions of the protesters.