Two men who worked on the hit movie “Black Swan” have mounted an unusual challenge to the film industry’s widely accepted practice of unpaid internships by filing a lawsuit on Wednesday asserting that the production company had violated minimum wage and overtime laws by hiring dozens of such interns.

The lawsuit, filed in federal court in Manhattan, claims that Fox Searchlight Pictures, the producer of “Black Swan,” had the interns do menial work that should have been done by paid employees and did not provide them with the type of educational experience that labor rules require in order to exempt employers from paying interns.

“Fox Searchlight’s unpaid interns are a crucial labor force on its productions, functioning as production assistants and bookkeepers and performing secretarial and janitorial work,” the lawsuit says. “In misclassifying many of its workers as unpaid interns, Fox Searchlight has denied them the benefits that the law affords to employees.” Workplace experts say the number of unpaid internships has grown in recent years, in the movie business and many other industries. Some young people complain that these internships give an unfair edge to the affluent and well connected.

One plaintiff, Alex Footman, a 2009 Wesleyan graduate who majored in film studies, said he had worked as a production intern on “Black Swan” in New York from October 2009 to February 2010.