the proletariat long before the October Revolution, implementation of the dictatorship was clearly defined by Lenin as early as in 1906, when he argued it must involve "unlimited power based on force and not on law," power that is "absolutely unrestricted by any rules whatever and based directly on violence." In The State and Revolution of 1917, Lenin once again reiterated the arguments raised by Marx and Engels calling for use of terror. Voices such as Kautsky calling for moderate use of violence met "furious reply" from Lenin in The Proletarian Revolution and the Renegade Kautsky (1918). Another theoretical and systematic argument in favor of organized terror in response to Kautsky's reservations was written by Trotsky in The Defense of Terrorism (1921). Trotsky argued that in the light of historical materialism, it is sufficient that the violence is successful for it to justify its rightness. Trotsky also introduced and provided ideological justification for many of the future features characterizing the Bolshevik system such as "militarization of labor" and concentration camps. Historical significance The Red Terror was significant because it was the first of numerous Communist terror campaigns which were waged in Soviet Russia and many other countries. It also triggered the Russian Civil War according to historian Richard Pipes. Menshevik Julius Martov wrote about Red Terror: The beast has licked hot human blood. The man-killing machine is brought into motion ... But blood breeds blood ... We witness the growth of the bitterness of the civil war, the growing bestiality of men engaged in it. The term 'Red Terror' was later used in reference to other campaigns of violence which were waged by communist or communist-affiliated groups. Some other events which were also called "Red Terrors" include: Hungarian Red Terror — the execution of 590 people who were accused of being involved in the counterrevolutionary coup against the Hungarian Soviet Republic on 24 June 1919. Spanish Red Terror — assassinations which were carried out during the Spanish Civil War. Red Terror (Greece) — a campaign of repression which was waged in Greece by the Communist organizations of the Greek Resistance (during the Axis occupation of Greece which coincided with World War II) and the Greek Civil War (1943–49). Ethiopian Red Terror — a campaigned of repression which was waged by the Derg during the rule of Mengistu Haile Mariam. Chinese Red Terror — a campaign of repression which is believed