Nigerian workers at a Malaysian owned oil company in the city of Port Harcourt are blaming two foreign managers for cuts in benefits. The unions for the workers have demanded that the managers be fired and leave the country. Union officials say police have been used to intimidate workers and the managers used derogatory language. Some staff at the company have already walked off the job and their are talks within the unions to expand the strike to other foreign-owned firms such as Shell and ChevronTexaco. Port Harcourt is the hub of Nigeria's oil industry and a strike there could cut the countries output by 500,000 barrels per day. The country is the fifth-largest supplier of crude to the United States.