 Following the creation of the 62 Organizations, the political branch of the CGT, to which he ascribed, Rucci quickly progressed inside the unions' hierarchy, alongside fellow UOM leader Augusto Vandor.At first a unionist leader in the SOMISA steelworking factory in San Nicolás de los Arroyos (the nation's largest), he assumed the post of press secretary of the UOM in 1960, and sat on its board of directors alongside Vandor, Paulino Niembro, Avelino Fernández and Lorenzo Miguel.He was named inspector in 1964 for the San Nicolás de los Arroyos union local, where he later became the general secretary.