Orthodox Marxism
Orthodox Marxism is the body of Marxist thought that emerged after the deaths of Karl Marx and Friedrich Engels in the late 19th century, expressed in its primary form by Karl Kautsky. Kautsky's views of Marxism dominated the European Marxist movement for two decades, and orthodox Marxism was the official philosophy of the majority of the socialist movement as represented in the Second International until the First World War in 1914, whose outbreak caused Kautsky's influence to wane and brought to prominence the orthodoxy of Vladimir Lenin.