This unique achievement made Siney a national figure. Local leaders in all parts of the country appealed to him to call another national convention. On his initiative, the Miners' National Association was constituted by the convention held in Youngstown, Ohio, in October, 1873. The convention elected Siney president. National headquarters were opened in Cleveland.
Wearied with endless strikes the convention had made arbitration, conciliation, and cooperation the basic principles of their constitution. Fortified with these principles, Siney and an associate visited the offices of all the coal companies in Cleveland. All except one of the operators turned them down. They would have nothing to do with a union. The exception was Marcus A. Hanna. When Siney assured Hanna that no strike would be called without previous resort to arbitration and that the officers of the union would order the men to keep at work even if an award went against them, Hanna accepted their proposition and undertook to bring the other operators into line. In spite of the widespread depression in the coal trade the National Association grew rapidly. Twenty-one thousand members were represented at the second convention held in Cleveland in October, 1874. But notwithstanding Hanna's great influence, many of the operators remained hostile to the union. Toward the close of 1874, the operators of the Tuscarawas Valley in Ohio announced a wage cut from ninety to seventy cents a ton. The miners determined to strike. Siney induced them to resort to arbitration. The umpire admitted a reduction to seventy-one cents. The miners were bitter against the decision which had gone almost completely against them. Only the great influence of Siney restrained them from striking at once.
Then one of the operators, the Crawford Coal Company, took advantage of the discontent. This company had refused to join Hanna and his associates in dealing with the union. During the arbitration proceedings, the Crawford Company locked out their men for demanding a check-weighman, and appealed to the operators' association for support. The associated operators refused. The Crawford Company then offered their locked-out men an advance of nine cents a ton above the rate fixed for the union miners by the arbitration award. The acquisitive instinct was stronger than the consciousness of kind among the non-union miners. They accepted and went back to work.