The Revolutionary Civic Union was the name of an armed paramilitary group and later far-right pro-fascist[1] Costa Rican political party.

The party was led by politician Frank Marshall Jiménez, denoted anti-communist and anti-Calderonista, who became a member of the Legislative Assembly.

His stepfather, Ricardo Steinvorth, of German origin, sent him to live in Germany where he was educated in the 1930s during the times of the Third Reich and even belonged to the Hitler Youth, but returned to Costa Rica after the Second World War sparked.

Marshall would become a bitter opponent of the government of Calderón Guardia and his communist allies, for which he fought alongside rebel caudillo José Figueres and other opposition figures against the "Caldero-communists" during the war of 48.

The rebel faction won and Calderón alongside other defeated political leaders including the Secretary General of the Costa Rican Communist Party Manuel Mora Valverde escaped to exile.