Twitter Inc. was sued by contract workers who argue they were a “contingent workforce” with the same duties as employees and shouldn’t have been laid off without notice when Elon Musk took over the company.

The class-action complaint filed Tuesday in San Francisco federal court is the latest legal fallout from Musk’s rapid move in November to eliminate more than half of Twitter’s head count just after he acquired the company for $44 billion.

The suit was brought on behalf of an unspecified number of workers hired by Twitter through employee staffing company TEKsystems Inc., which was also named as a defendant in the case.