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The Union Federation of Bolivian Mine Workers is a labor union in Bolivia that represents miners. Bolivia's miners are commonly regarded as the country's most class-conscious workers. The FSTMB has played an important role in Bolivia's recent history. The union emerged in the wake of a violent clash between government troops and striking tin miners in Oruro and Potosí in 1942. The FSTMB was founded on June 11, 1944 at a congress held in Huanuni, Oruro. The Huanuni Congress included delegates from 25 local unions, the Revolutionary Nationalist Movement, and the Revolutionary Workers' Party. The newly formed union had a membership of 60,000 miners. Juan Lechín, the leader of the miners' movement and POR member, was chosen as the union's Executive Secretary. Divisions emerged in the union's leadership over how to relate to the new government of Major Gualberto Villarroel. MNR members wanted the FSTMB to support Major Villarroel, but the Lechín and the other members of the POR wanted the union to remain independent of the government. The MNR's position was defeated in 1946 when the FSTMB adopted the "Pulacayo Thesis," which called for a workers' revolution and other radical goals. In 1947, POR members formed a caucus in the union, the Bloque Parlamentario Minero, to represent their interests. The FSTMB faced renewed government suppression following a series of strikes in 1949, forcing Lechín and other union leaders into exile. (via Freebase)