Original sentence: As a result of external pressures, in Russia's case invasions by a dozen countries to break up the revolution, Russia and China developed fortress syndromes and a security apparatus that came to be used against internal opponents as well as foreign agents.Communist Parties in Russia and later China came to power in the course of civil wars fought between the Communists and the remnants of collapsed imperial regimes.Over the span of decades, many were killed or arrested, no small number of them communists who opposed party rule.This article mainly discusses communism as a theory and a movement, further critiques of "communist states" are to be found at: Communist state - Criticism and Advocacy
Edited sentence: Books documenting human rights violations.Crimes of Soviet Communists Links to many sites with documented human rights violations.Critics note that this argument makes it difficult to criticize Capitalist states as it can similarly be claimed that problems in apparently Capitalist states are explained by that these states are not Capitalist.Further critiques of "communist states" are to be found at: Communist state - Criticism and Advocacy.How many did the communist regimes murder.Lack of freedom of speech, religious and ethnic persecutions, destruction of historical and cultural heritages, environmental distaters, lacking democracy, restriction of emigration, personality cults, and inherited dictatorship are other charges (See external links for references).Museum of Communism FAQ Professor Bryan Caplan's documentation of Communist human rights violations.Numerous human rights crimes have been attributed to states ruled by Communist parties.Professor R.Rummel's documented summary.Some Communists argue that these states were not Communist.The Black Book of Communism Scholarly summary of the human rights violations by Communism.They include  executions, slave labor camps with high mortality, deliberate mass starvations, and ethnic genocides causing the deaths of tens of millions.Those critical also argue that the states were ruled by Communist parties trying to implement Marx's theory, that many different variants were tried by different states and by the same state at different times, and that the failure of these many attempts indicates that this theory is fundamentally flawed