Which preposition to use with soviets

from Occurrences 2%

Ernest Hemingway says Russo-Japanese pact has not kept Soviet from sending aid to China.

versus Occurrences 2%

Soviet versus civilization, by Augur, pseud. of Vladimire Poliakoff.

in Occurrences 1%

And we might support autocracy in one state and soviets in another, if it seemed suitable.

of Occurrences 1%

Briefly, if ever Trotzky had become Commissar of the Soviet of Manhattan, Miss Althea and those like her would have been the first candidates for a drumhead court-martial.

Which preposition to use with  soviets