New York ? Three funeral home directors and four former employees of a biomedical supply company secretly removed skin, bone and other body parts from dozens of corpses awaiting cremation at Rochester funeral homes, prosecutors said Thursday.

An indictment unsealed Thursday charges the seven with body stealing, unlawful dissection and other counts. The most serious charges carry maximum 20-year prison sentences.

Four other men, including the company’s owner, former dentist Michael Mastromarino, were charged last year with removing bone and tissue from 1,077 bodies at funeral homes without the permission of families. All have pleaded not guilty.

Prosecutors said Mastromarino made millions of dollars by selling body parts to biomedical companies that supply material for common procedures.

In October, seven funeral home directors linked to the scheme pleaded guilty in New York City to undisclosed charges and agreed to cooperate with investigators.