“If we were to hang the last capitalist, another would appear to sell us the rope.”

Often attributed to Stalin and Marx, according to the book, They Never Said It (1989), p. 64, the phrase derives from a rumour that Lenin said this to one of his close associates, Grigori Zinoviev, not long after a meeting of the Politburo in the early 1920s, but there is no evidence that he ever did. It has also been believed that Lenin may have expressed that the profit motive cannot be undone in that "If we were to hang the last capitalist, another would suddenly appear to sell us the rope". Experts on the Soviet Union reject the rope quote as spurious. However, it is established that Lenin did remark on the same underlying theme (even if not in reference to rope), namely, that capitalists in their addiction to high profits could not help themselves from selling things to a socialist state, even if it was against their own long-term interests by strengthening an enemy; Edvard Radzinsky covers it in his discussion of Lenin's comments on the "deaf-mutes" in Radzinsky's biography of Stalin.
Misattributed

Often attributed to Lenin or Stalin, less often to Marx. According to the book, "They Never Said It", p. 64, the phrase derives from a rumour that Lenin said this to one of his close associates, Grigori Zinoviev, not long after a meeting of the Politburo in the early 1920s, but there is no evidence that he ever did. Experts on the Soviet Union reject the rope quote as spurious.
Misattributed

Section 2, member 3, subsection 12, Covetousness, a Cause.
The Anatomy of Melancholy (1621), Part I

Posthumous attributions, Tupac: Resurrection (2003)
Source: Resurrection, 1971-1996

A son [Timon le Misanthrope] exemple ie denonce à ces calumniateurs diaboliques, que tous ayent à se pendre dedans le dernier chanteau de ceste lune. Ie les fourniray de licolz.
Prologue of the 1548 "old" edition.
Gargantua and Pantagruel (1532–1564), Fourth Book (1548, 1552)

Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

Source: The Name of the Wind (2007), Chapter 39, “Enough Rope” (p. 281)

Source: Mockingjay