United Steelworkers betrays Constellium strike in Alabama after weeks of isolating workers Workers at Paris-based aluminum sheet manufacturer Constellium in Muscle Shoals, Alabama were sent back to work Tuesday after they approved a five-year contract brought back by the United Steelworkers (USW), ending a nearly month-long strike. More than 400 aluminum workers at the plant walked out December 15 after voting near-unanimously to strike against unfair labor practices, including unsafe working conditions, threats by the company to end seniority rights, and cuts to health care benefits. Constellium plant in Muscle Shoals, Alabama (Credit: Constellium.com) Both the vote totals and substantive details of the contract have not been made public by the USW, in line with its policy of isolating the struggle of the Constellium workers.