udarnik
A shock worker; a super-productive worker in the Soviet Union and the other countries from the Soviet Bloc.
historical
Two short stories … give a true, warm and unvarnished picture of the formation of the character and consciousness of a young Komsomol worker in the heat of socialist competition and udarnik work.
Where it comes from
From Russian уда́рник (udárnik), from уда́р (udár, “strike, blow, shock”) + -ник (-nik).
Adapted from the Wiktionary entry udarnik (CC BY-SA 4.0).