Why did Russia want to overthrow czar Nicholas II?

In March 1917, the army garrison at Petrograd joined striking workers in demanding socialist reforms, and Czar Nicholas II was forced to abdicate. In July 1918, the advance of counterrevolutionary forces caused the Yekaterinburg Soviet forces to fear that Nicholas might be rescued.

Explanation:

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March 1917, Army garrison at Petrograd joined striking workers in demanding socialist reforms, and Czar Nicholas II was forced to abdicate

Explanation:

The advance of counterrevolutionary forces caused the Yekaterinburg Soviet forces to fear that Nicholas might be rescued.

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