Early in his political career, Debs was a member of the Democratic Party. He was elected as a Democrat to the Indiana General Assembly in 1884. After working with several smaller unions, including the Brotherhood of Locomotive Firemen, Debs led his union in a major ten-month strike against the CB&Q Railroad in 1888. Debs was instrumental in the founding of the American Railway Union (ARU), one of the nation's first industrial unions. After workers at the Pullman Palace Car Company organized a wildcat strike over pay cuts in the summer of 1894, Debs signed many into the ARU. He led a boycott by the ARU against handling trains with Pullman cars in what became the nationwide Pullman Strike, affecting most lines west of Detroit and more than 250,000 workers in 27 states. Purportedly to keep the mail running, President Grover Cleveland used the United States Army to break the strike. As a leader of the ARU, Debs was convicted of federal charges for defying a court injunction against the strike and served six months in prison.