Keywords: Working class History ; 19th century ; Russia (Federation) ; Saint Petersburg ; Working class History ; 20th century ; Russia (Federation) ; Saint Petersburg ; Working class Political activity ; Russia (Federation) ; Saint Petersburg ; Peasantry History ; Russia (Federation) ; Saint Petersburg ; Rural-urban migration History ; Russia (Federation) ; Saint Petersburg ; Social classes History ; Russia (Federation) ; Saint Petersburg ; Saint Petersburg (Russia) Population ; History ; Sankt Petersburg ; Arbeiterklasse ; Proletarisierung ; Landflucht ; Geschichte 1864-1914