Spanish Civil War
Popular Front's victory and escalation

The Popular Front narrowly won the 1936 general election. The revolutionary left-wing masses took to the streets and freed prisoners. In the thirty-six hours following the election, sixteen people were killed (mostly by police officers attempting to maintain order or to intervene in violent clashes) and thirty-nine were seriously injured. Also, fifty churches and seventy conservative political centres were attacked or set ablaze. Manuel Azaña was called to form a government before the electoral process had ended. He shortly replaced Zamora as president, taking advantage of a constitutional loophole. Convinced that the left was no longer willing to follow the rule of law and that its vision of Spain was under threat, the right abandoned the parliamentary option and began planning to overthrow the republic, rather than to control it.

PSOE's left wing socialists started to take action. Julio Álvarez del Vayo talked about "Spain being converted into a socialist Republic in association with the Soviet Union". Francisco Largo Caballero declared that "the organized proletariat will carry everything before it and destroy everything until we reach our goal". The country had rapidly become anarchic. Even the staunch socialist Indalecio Prieto, at a party rally in Cuenca in May 1936, complained: "we have never seen so tragic a panorama or so great a collapse as in Spain at this moment. Abroad, Spain is classified as insolvent. This is not the road to socialism or communism but to desperate anarchism without even the advantage of liberty". The disenchantment with Azaña's ruling was also voiced by Miguel de Unamuno, a republican and one of Spain's most respected intellectuals who, in June 1936, told a reporter who published his statement in El Adelanto that President Manuel Azaña should commit suicide "as a patriotic act".

Laia Balcells observes that polarisation in Spain just before the coup was so intense that physical confrontations between leftists and rightists were a routine occurrence in most localities; six days before the coup occurred, there was a riot between the two in the province of Teruel. Balcells notes that Spanish society was so divided along Left-Right lines that the monk Hilari Raguer stated that in his parish, instead of playing "cops and robbers", children would sometimes play "leftists and rightists". Within the first month of the Popular Front's government, nearly a quarter of the provincial governors had been removed due to their failure to prevent or control strikes, illegal land occupation, political violence and arson. The Popular Front government was more likely to prosecute rightists for violence than leftists who committed similar acts.

Azaña was hesitant to use the army to shoot or stop rioters or protestors as many of them supported his coalition. On the other hand, he was reluctant to disarm the military as he believed he needed them to stop insurrections from the extreme left. Illegal land occupation became widespread—poor tenant farmers knew the government was disinclined to stop them. By April 1936, nearly 100,000 peasants had appropriated 400,000 hectares of land and perhaps as many as 1 million hectares by the start of the civil war; for comparison, the 1931–33 land reform had granted only 6,000 peasants 45,000 hectares. As many strikes occurred between April and July as had occurred in the entirety of 1931. Workers increasingly demanded less work and more pay. "Social crimes"—refusing to pay for goods and rent—became increasingly common by workers, particularly in Madrid. In some cases, this was done in the company of armed militants. Conservatives, the middle classes, businessmen and landowners became convinced that revolution had already begun.

Prime Minister Santiago Casares Quiroga ignored warnings of a military conspiracy involving several generals, who decided that the government had to be replaced to prevent the dissolution of Spain. Both sides had become convinced that, if the other side gained power, it would discriminate against their members and attempt to suppress their political organisations.
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