Why did Marxist teaching become widespread in Russia?

Marxism is the ideology of the working class. In the late 19th and early 20th centuries, the working class found itself in difficult conditions: working conditions did not meet their requirements, the working day was long. For the dissemination of this teaching, a favorable environment developed: the actions of the working class became a frequent occurrence. The Marxists took advantage of this: they began to create special organizations, circles, where the propaganda of the ideas of Marxism was carried out.