The film tells about the creation of the first collective farm communes and class enmity. Vasyl, a member of the Komsomol, with the help of a local party organization, gets a tractor and plows private boundaries "on kulak fields." However, this enthusiasm will cost him dearly.

A Jewish tannery worker, Nahum Beychik, invents a machine that makes hard work easier in leather tanning. A private entrepreneur, former kulak Lopatin, tries to buy the invention and use it for his own selfish interests. Having met with a decisive refusal from Nahum Beychik, the kulak exploits the anti-Semitic sentiments of the backward part of the workers and, with the help of his accomplices, hooligans and truants, tries to kill the inventor.