The institution whose approval Lenin used to gain a modicum of legitimacy for his seizure of power in October 1917 was

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Lenin used the approval of the Congress of Soviets, a political body representing local soviets of workers' and soldiers' deputies, to legitimize the Bolshevik seizure of power in October 1917. This body endorsed the Bolshevik action, providing Lenin and his party with a semblance of legitimacy based on the support of workers and soldiers.

The Institution Whose Approval Lenin Used to Gain a Modicum