During the lifetime of great revolutionaries, the oppressing classes constantly hounded them, received their theories with the most savage malice, the most furious hatred and the most unscrupulous campaigns of lies and slander. After their death, attempts are made to convert them into harmless icons, to canonise them, so to say, and to hallow their names to a certain extent with the object of duping the latter, while at the same time robbing the revolutionary theory of its substance.