“You can see these two species coexisting in a long period of stability; then on of the them drops out and all hell breaks loose. Tremendous instability. That's the Soviet Union.”
Christopher Langton in: Roger Lewin (1990) Complexity: Life at the Edge of Chaos New York, Macmillan. p. 196
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Christopher Langton 11
American computer scientist 1949Related quotes
Ibid.
Essays and reviews, As Of This Writing (2003)

Gause 1934
[Foraging habitat partitioning in Roseate and Common Terns, The Auk, 107, 2, April 1990, 351–358, 10.2307/4087619, https://www.jstor.org/stable/4087619]

The Tribune (28 March 1986).
1980s

“I never wanted two things: money or to live outside Soviet Union.”
As quoted in Lev Yashin, the impregnable Spider https://www.fifa.com/news/lev-yashin-the-impregnable-spider.

Statement in September 1939, as quoted in "Stalin's pact with Hitler" in WWII Behind Closed Doors at PBS http://www.pbs.org/behindcloseddoors/episode-1/ep1_stalins_pact.html
Contemporary witnesses

“Fascism lasted twelve years in Germany. Stalinism lasted twice as long in the Soviet Union.”
Progress, Coexistence and Intellectual Freedom (1968), Dangers, Police Dictatorships
Context: Fascism lasted twelve years in Germany. Stalinism lasted twice as long in the Soviet Union. There are many common features but also certain differences. Stalinism exhibited a much more subtle kind of hypocrisy and demagogy, with reliance not on an openly cannibalistic program like Hitler's but on a progressive, scientific, and popular socialist ideology.
This served as a convenient screen for deceiving the working class, for weakening the vigilance of the intellectuals and other rivals in the struggle for power, with the treacherous and sudden use of the machinery of torture, execution, and informants, intimidating and making fools of millions of people, the majority of whom were neither cowards nor fools. As a consequence of this "specific feature" of Stalinism, it was the Soviet people, its most active, talented, and honest representatives, who suffered the most terrible blow.

Clive James From the Land of Shadows (London: Picador, 1983) p. 222.
Criticism

2006
Source: http://www.democracynow.org/article.pl?sid=06/12/13/1451213