An Upper East Side hair colorist to the stars whose clients include Nicole Kidman and Kate Hudson is also a racist, vindictive boss, according to current and former workers and legal documents.

Mane maven Sharon Dorram, 59, and some of her salon supervisors would discriminate against underlings because of their race or religion — then retaliate, including threatening to fire them, if they told anyone, say two complaints filed with the New York City Human Rights Commission on Monday.

Former receptionist Ingrid Sandoval, 22, says in her complaint that Dorram “engaged in racist treatment’’ when she forced minority workers to wear their hair up while their white coworkers didn’t have to.

An ex-manager was recorded saying she knows Dorram to be “a racist,” add the papers, filed by Sandoval’s lawyer, Patrick Boyd.

According to Boyd, two previous complaints were filed with the commission this past spring citing the discriminatory hair edict. Sandoval’s complaint alleges that after those two complaints were filed, Dorram asked her employees to sign affidavits that falsely stated there was a longstanding policy at the salon requiring workers there to wear their hair up regardless of race.

Sandoval says in her complaint that when some workers resisted, the salon’s former manager, Linda Sabky, brought receptionists into a shop elevator without cameras and told them they’d be fired if they blabbed about the situation or booked appointments for hairdressers who didn’t sign the forms.

The receptionists refused, and Dorram and some supervisors retaliated by removing the workers’ chairs at the front desk and forcing them to stand for the entirety of their shifts, her complaint alleges.

Sandoval — who also filed a complaint with the federal Occupational Health and Safety Administration this past spring alleging an unsafe work environment at the salon — was eventually fired.

Current hair stylist Matthew Ustaev, 27, claims in his own complaint that he was subjected to “anti-Semitic harassment” and referred to as the “stupid Jew” by the head hair stylist of the salon, Tim Lehman.

Ustaev says in the papers that Dorram also initially thought he was the one who filed the complaint with OSHA — and soon his scheduled appointments were given to other stylists so he’d have no work.

In April, after Ustaev hired a lawyer, Dorram told him in a conversation he recorded that said if he didn’t take her to court, she’d help “build” him back up, his complaint said.

“I am going to get behind you, and you should drop this lawsuit because it’s not fair, it’s not fair to the salon,” Dorram allegedly said.

Ustaev refused.

His income has now “decreased substantially,” and he suffers from stress and anxiety from his treatment by Dorram and Lehman and continues to be bullied at work, his complaint states.

Dorram’s lawyer, Carolyn Richmond, told The Post, “The salon will not comment on any specific employee or complaint and frankly has not seen four lawsuits.

“However, I can say that it has always been the policy of Sharon and the salon to follow equal employment laws.”

Neither Sabky nor Lehman returned Post calls for comment.

Additional reporting by Alex Taylor