Four Arab-American drivers who said they were harassed by their supervisors at a FedEx Corp. facility in Wilmington, Massachusetts have filed a lawsuit alleging they were subjected to a steady flow of vitriol and discrimination.

FedEx spokesman Maury Lane has declined to comment on the specific allegations in the lawsuit. “The company has a zero tolerance policy on this kind of behavior,” Lane said in a recent interview. “If this behavior is reported or seen, we will immediately investigate and terminate any employee at any level guilty of these actions.”

In a complaint filed in July 2006 with Massachusetts Commission Against Discrimination, Loay el-Dagany, from Kuwait, said his supervisor, David Goyette, repeatedly called him a terrorist and threw packages at him.

Lane said Goyette no longer works at FedEx. He would not say under what terms he left the company. Goyette could not be reached.

Michael Melnyk, the other supervisor named in the suit, still works for the company. He also could not be reached.

FedEx has argued that the plaintiffs, who worked for the company’s ground package division, were independent contractors and ineligible for protection under state anti-discrimination laws.

In March, the Massachusetts Commission Against Discrimination ruled the employees’ complaints were valid, clearing the way for the drivers to pursue their case. They are seeking punitive damages similar to a discrimination case filed last year by drivers of Lebanese descent in California, where a jury awarded $61 million to two FedEx employees who contended that a manager had harassed them with racial slurs.