“I'm getting sick and tired of people saying that this movement has been infiltrated by Communists. There are as many Communists in this freedom movement as there are Eskimos in Florida.”
Interview in Playboy (January 1965) https://web.archive.org/web/20080706183244/http://www.playboy.com/arts-entertainment/features/mlk/04.html
1960s
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Martin Luther King, Jr. 658
American clergyman, activist, and leader in the American Ci… 1929–1968Related quotes

Declaration of Conscience (1950)
Context: The American people are sick and tired of being afraid to speak their minds lest they be politically smeared as "Communists" or "Fascists" by their opponents. Freedom of speech is not what it used to be in America. It has been so abused by some that it is not exercised by others.
The American people are sick and tired of seeing innocent people smeared and guilty people whitewashed.

Speech in Glasgow (10 April 1949), quoted in The Times (11 April 1949), p. 4
Prime Minister

Said during his exile in Peking, as quoted by Oriana Fallaci (June 1973), Intervista con la Storia (sixth edition, 2011).
Interviews

Resignation announcement (17 July 1959)

“In fact, the drive against the Communists is aimed, above all, against the labor movement.”
"Why I am a Communist" (1947)

Source: Hitler’s Beneficiaries: Plunder, Racial War, and the Nazi Welfare State (2007), p. 16

Mandel answering the question Is it not true that Mikhail Gorbachev stated that Perestroika is a true new revolution? in an interview in New Times, no. 38/1990, French edition. Quote from Harpal Brar's Trotskyism or Leninism?, pp. 56.
The Naked Communist (1958)