One Step Forward, Two Steps Back https://marxistleninists.org/Lenin/one%20step%20forward%20two%20steps%20back/party%20rules.htm
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Lenin on how Opportunism Expresses Capitalist Policy and Interests https://us.politsturm.com/lenin-on-how-opportunism-expresses-capitalist-policy-and-interests
One Step Forward, Two Steps Back https://marxistleninists.org/Lenin/one%20step%20forward%20two%20steps%20back/paragraph%20one%20of%20the%20rules.htm
V. Shulyatikov. The Justification of Capitalism in West-European Philosophy. (From Descartes to E. Mach). Moscow, 1908 https://www.marxists.org/archive/lenin/works/1908/remarks/ch04.htm
Letters: Marx-Engels Correspondence 1885. Ireland http://hiaw.org/defcon6/works/1886/letters/86_05_22.html