EXCLUSIVE: The Marvelous Mrs. Maisel is having labor pains. The Emmy-winning Amazon comedy series’ production company, Picrow Streaming, has been accused by IATSE Local 52 in New York of making “coercive statements” and “changes in terms of conditions of employment” in violation of federal labor law that prohibits discriminating against employees because of their union activities. The allegations are currently under investigation by the National Labor Relations Board.

The union’s charge, obtained from the NLRB through an FOIA request, claims that over the past six months, Picrow has violated the National Labor Relations Act “by its discriminatory treatment of union shop stewards and supporters” who “made complaints to management regarding hours and other working conditions during the film production of The Marvelous Mrs. Maisel.”

A copy of the union’s charge, in which the names of a shop steward and a supervisor have been redacted, alleges that “The production team has retaliated against [name redacted] and other members of Local 52 because of this union activity. To which, [name redacted] threatened to remove Local 52 members from the film crew and threatened to never hire [name redacted] again. The production team in fact recently offered [name redacted] a position in the Season 3 production that is a demotion from…Season 2.”

Amazon Studios flatly denied the charge in a statement to Deadline. “Amazon Studios fully supports the entire team behind The Marvelous Mrs. Maisel,” a spokesperson said. “While we don’t comment on specific personnel matters, these allegations are demonstrably false. Amazon Studios does not tolerate any form of discrimination or retaliation.”

IATSE Studio Mechanics Local 52, which reps below-the-line crew excluding camera personnel, editors and art directors, did not return calls, and Picrow did not respond to a request for comment.

A crew member on the series, however, said “It’s a good show to work on. They treat the crew really well. We actually look forward to going back.”

The Amazon show, the defending Emmy Best Comedy Series winner, garnered a second Best Actress in a Comedy or Musical Golden Globe win Sunday night for star Rachel Brosnahan. It is currently on hiatus, gearing up for its third season.