San Diego-based canned tuna giant Bumble Bee Seafoods has known for years that fishing vessels in its supply fleet used forced labor but failed to stop the practice, according to a lawsuit filed Wednesday in San Diego federal court that’s believed to be the first ever to allege human trafficking against a U.S. seafood company.

A group of four fishermen from Indonesia, co-counseled by attorneys for NGO Greenpeace USA, have sued Bumble Bee Foods, claiming they experienced forced labor and human trafficking while working on fishing vessels supplying the company.

Lawyers representing four Indonesian fishermen say they were beaten and trapped on vessels that were part of the global supply chain that provided tuna to Bumble Bee Seafoods.