Leon Festinger and John Thibaut. "Interpersonal communication in small groups." The Journal of Abnormal and Social Psychology 46.1 (1951): 92.
“Ex-members, even those with righteous complaints, tend to reconstruct their experiences — ambiguous situations at worst — into totally negative encounters. They tend to demonize the leaders and turn the members into zombielike followers. Harmless comments are recast into sinister threats, group jargon into conspirational fantasies.”
As quoted in Finding Enlightenment : Ramtha's School of Ancient Wisdom (1998), ISBN 1-885223-61-7, Beyond Words Publishing, p. 164
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J. Gordon Melton 1
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Leon Festinger and John Thibaut. "Interpersonal communication in small groups." The Journal of Abnormal and Social Psychology 46.1 (1951): 92.

1950s, What Desires Are Politically Important? (1950)
Source: Unpopular Essays
Context: It is normal to hate what we fear, and it happens frequently, though not always, that we fear what we hate. I think it may be taken as the rule among primitive men, that they both fear and hate whatever is unfamiliar. They have their own herd, originally a very small one. And within one herd, all are friends, unless there is some special ground of enmity. Other herds are potential or actual enemies; a single member of one of them who strays by accident will be killed. An alien herd as a whole will be avoided or fought according to circumstances. It is this primitive mechanism which still controls our instinctive reaction to foreign nations. The completely untravelled person will view all foreigners as the savage regards a member of another herd. But the man who has travelled, or who has studied international politics, will have discovered that, if his herd is to prosper, it must, to some degree, become amalgamated with other herds.

Interview with ABC News (10 October 2008) http://abcnews.go.com/Politics/Vote2008/story?id=5922487&page=1
2008

affirmed on page 213 of The Ultimate Quotable Einstein
1930s, Why Do They Hate the Jews (1938)

Source: Mind, Self, and Society. 1934, p. 1

“Always turn a negative situation into a positive situation.”