“We should not allow the word "democracy" to be utilized apologetically to represent the dictatorship of the exploiting classes.”
Method of Guerrilla Warfare (1963)
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Ernesto Che Guevara 258
Argentine Marxist revolutionary 1928–1967Related quotes

71. The Election of the Judiciary by The Workers
ABC's of Communism
Source: A History of Economic Thought (1939), Chapter VIII, Modern Economics, p. 370

as quoted in Straight Through the Heart: How the Liberals Abandoned the Just Society (Harper and Collins: 1995), p. 243.
Adam Przeworski and Fernando Limongi, "Modernization: Theories and Facts", World Politics (Jan., 1997)

Actually from State and Revolution by Vladimir Lenin, paraphrasing Marx in The Civil War in France.
Misattributed

Source: (1917), Ch. 5 [Lenin, Vladmir Illych, The State and Revolution, 1917, https://www.marxists.org/archive/lenin/works/1917/staterev/ch05.htm, Marx grasped this essence of capitalist democracy splendidly when, in analyzing the experience of the Commune, he said that the oppressed are allowed once every few years to decide which particular representatives of the oppressing class shall represent and repress them in parliament!]

No Compromise – No Political Trading (1899)

Voprosi Leninizma, Gosudarstvennoe izdatelstvo politicheskoy literaturi, (1939)
Stalin's speeches, writings and authorised interviews