Answer
The All-Russian Central Executive Committee, where Mikhail Kalinin served as Chairman, held significant power in the governance of the Russian Soviet Federative Socialist Republic (RSFSR), a constituent republic of the Soviet Union. Kalinin's role entailed overseeing legislative and executive functions, guiding the activities of the Soviet government, and contributing to policy-making processes within the RSFSR, influencing decisions that shaped the political and social landscape of the republic.