The Cheka: vehicle of Communist oppression, or shield and sword of the revolution?

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Sources:

Rabinowitch, Alexander. The Bolsheviks In Power: The First Year of Soviet Rule in Petrograd. Indiana University Press, 2007.

Golinkov, D. L. Krushenie antisovietsogo podpolya v SSSR, 1917-1925 gg. Izdatelstvo politicheskoi literatury, Moskva, 1975