Which alliance does lenin declare to be 'firm', close and insoluble

Lenin declared the alliance between the proletariat and the peasantry to be "firm, close, and insoluble."

White army

The White Army refers to the anti-Bolshevik forces that opposed the Bolshevik government during the Russian Civil War (1918-1922). It was composed of a diverse range of groups, including former members of the Russian Imperial Army, liberal politicians, monarchists, nationalists, and other anti-communist factions. The White Army aimed to overthrow the Soviet government and restore the Russian Provisional Government or establish a new democratic regime. However, despite receiving support from various foreign powers, the White Army ultimately lost the civil war to the Red Army under the leadership of the Bolsheviks.

Lenin declared the alliance between the working class and the peasantry to be "firm, close, and insoluble" during the Russian Revolution.