A lawyer for actor Robert Brown filed the papers in federal court in New York City on Wednesday. The 29-year-old Brown says he was stopped buying a $1,350 Movado watch and targeted because he's black.
The lawsuit says many others have been targeted at the store because of race. Brown first filed the lawsuit last month.
The suit says Macy's has not changed its wrongful security practices, even after a 2005 settlement with the attorney general over racial profiling complaints. A separate lawsuit against New York police says the department encourages the practices.
Macy's didn't comment on the suit but says it doesn't discriminate. City lawyers didn't immediately comment.
A judge must approve class-action status.