The coup of 1979 allowed for the rise of militant left-wing groups in the country. The five largest groups, Farabundo Martí People's Forces of Liberation (FPL), Communist Party of El Salvador (PCES), National Resistance (RN), People's Revolutionary Army (ERP), and the Revolutionary Party of the Central American Workers – El Salvador (PRTC) to join forces on October 10, 1980, nearly one year after the coup, to form the Farabundo Martí National Liberation Front (FMLN), the most prominent opposition force to the Salvadoran government throughout the Salvadoran Civil War. The group was named after Farabundo Martí, the leader of the Communist Party during an uprising in 1932 which resulted in the massacre of 10,000 to 40,000 peasants under the rule of Maximiliano Hernández Martínez.