The Provisional government which replaced the Tsar had to share power with the Petrograd Soviet.
Explanation:
During the Russian Revolution of 1917 the Provisional government shared power with the Petrograd Soviet (council). The latter comprised of workers and soldiers (lower class people and the political left) who pressured the 'bourgeois' provisional government.
To share power the Provisional government faced lots of challenges due to political factionalism and division of state structures.
The Petrograd Soviet which cooperated with the government to controled the railway, factories and the military. While the provisional government held state power.
