Miguel Primo de Rivera forces. Alfonso XIII suspended the monarchy on 14 April 1931, leaving the royal family in Madrid. The act ushered in the Second Republic. Two years later Primo de Rivera's eldest son, José Antonio, founded the Falange, a Spanish fascist party. Both José Antonio and his brother Fernando were arrested in March 1936 by the republic, and were executed in Alicante prison by Republican forces once the Spanish Civil War began in July 1936. The Nationalists led by Francisco Franco won the Civil War and established a far more authoritarian regime. By that time, many Spaniards regarded Primo de Rivera's relatively
Francisco Largo Caballero succeeded him as head of the party and of the UGT. Moderate in his positions at the beginning of his political life, he advocated maintaining a degree of UGT cooperation with the dictatorial government of General Miguel Primo de Rivera, which permitted the union to continue functioning under his military dictatorship (that lasted from 1923 to 1930). This was the start of his political conflict with Indalecio Prieto, who opposed all collaboration with the dictatorial regime. He was Minister of Labor Relations between 1931 and 1933, in the first governments of the Second Spanish Republic, headed by Niceto Alcalá-Zamora, and