Marathon's Texas City refinery [Photo: Marathon Petroleum Corporation]The national contract covering roughly 30,000 oil refinery workers across the United States expires at midnight Sunday morning. The expiration of of the refinery contract occurs amidst growing class sturggle in the US. Refinery workers must consciously link up with this developing movement, combining their struggle into a broader fight against the corporate oligarchy. Repeated attempts by refinery workers to fight management have run up against the imposed isolation enforced by the union bureaucracy. The fight confronting refinery workers is not a narrow contract dispute but part of a broader struggle by the working class against the capitalist system itself.