The National Union of Mine, Metal, Steel and Allied Workers of the Mexican Republic (Spanish: Sindicato Nacional de Trabajadores Mineros, Metalúrgicos, Siderúrgicos y Similares de la República Mexicana, or SNTMMSSRM) is a union of coal and copper miners, as well as iron and steel workers, in Mexico.
In 1949, when Lombardo Toledano left the CTM to form the rival General Union of Workers and Campesinos (UGOCM) and the Popular Party, the SNTMMSRM joined these new organizations.
The ruling Institutional Revolutionary Party (PRI) and the CTM saw Lombardo Toledano and these unions as a threat, and in the 1950 the government installed charros (corrupt labor bosses) in the leadership of the SNTMMSSRM.
The most important of these charros was Napoleón Gómez Sada, who was the president of the SNTMMSSRM for decades until he was replaced by his son in 2001.
The current leader of the SNTMMSSRM is Napoleón Gómez Urrutia, a disgraced[1] union leader accused of having embezzled US$55 million that was supposed to be used to pay workers' severance payments at the Mexicana de Cananea mining company and that ended up being diverted[2] by Gómez Urrutia, who later fled to Canada to avoid arrest.