The workers were threatened on August 16 midnight and a complaint in this regard was filed by the unit owner before Manjeri police on August 18, police said.
A 12-member gang had threatened them asking them to leave the state before August 20 failing which they would be harmed.
Police have registered a case and investigation is on.
Police said the local community in the area have promised all help to the 14 workers, 11 of whom are from the majority community.