Amid economic crisis caused by falling tin prices, Pres. Gualberto Villarroel was killed and his regime overthrown by rebellious workers, soldiers, and students. The provisional government was recognized by Argentina and the U.S.
Delegates to the fourth annual meeting of the Union Federation of Mine Workers of Bolivia(FSTMB) signed a Trotskyist declaration that proclaimed their desire for revolution through an alliance with the National Revolutionary Movement (MNR) and the peasants.
