It would possibly depend upon your definition of "Serfdom", but I believe the 1917 revolution and subsequent overthrow of the Tsar effectively ended Serfdom in Russia by any definition. The pre-revolutionary Russian economy was heavily dependent on free labour, which was augmented by exiled prisoner labour. Earlier attempts at freeing the Serfs during the Romanov Dynasty ended in unpleasantness and the Serfs not being freed.
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She expanded serfdom.
Alexander II
Czar Alexander II freed the serfs in his empire in 1742. While they were freed, they were still very poor and still worked in terrible conditions.
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RUSSIA