The official commentary of the Social Democratic Party of Germany (SPD) on their brief 1891 Erfurt Program (by Karl Kautsky, party leader August Bebel and Eduard Bernstein). It became and is still considered the seminal (and popular) text for Orthodox Marxism and the Second International. Это и многое другое вы найдете в книге The Class Struggle. Erfurt Program (Karl Kautsky)