What were the two sides in the spanish civil war?​

Spain quickly erupted into civil war. The left side, known as the Republicans, was formed by the Spanish government together with unions, communists, anarchists, workers, and peasants. On the other side were the Nationalists, the rebel part of the army, the bourgeoisie, the landlords, and, generally, the upper classes.

The two sides were the Republicans and the Nationalists.

If this is incorrect, please, don't refrain to tell me. Thank you.

the russian revolution of 1917 involved the collapse of an empire under tsar nicholas ii and the rise of marxian socialism under lenin and his bolsheviks.