circulated since early 2015, debunked by Snopes in June 2016 https://www.snopes.com/fact-check/warren-disarm-them-ourselves/. Resembles the Stalin-attributed "If the opposition disarms, well and good. If it refuses to disarm, we shall disarm it ourselves."
Misattributed
“If the opposition disarms, all is well and good. If it refuses to disarm, we shall disarm it ourselves.”
The Political Report of the Central Committee, The Fifteenth Congress of the C.P.S.U.(B.) (7 December 1927) http://marx2mao.com/Stalin/FC27.html#s5iii
Stalin's speeches, writings and authorised interviews
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Joseph Stalin 95
General secretary of the Communist Party of the Soviet Union 1879–1953Related quotes
Rally in Idaho Falls, Idaho, May 12, 2000. http://www.renewamerica.us/archives/speeches/00_05_12idahofalls.htm.
2000
Speech to the Conservative Party conference http://www.theguardian.com/politics/2002/oct/07/conservatives2002.conservatives1 (07 October 2002)
"Escape from Freedom" http://journalism.nyu.edu/faculty/files/willis-tomfrank.pdf, Situations: Project of the Radical Imagination, Vol 1, No 2 (2006)
Concluding Speech Following the Discussion On the Report of Peace (8 November 1917) http://www.marxists.org/archive/lenin/works/1917/oct/25-26/26c.htm; Collected Works, Vol. 26.
1910s
Everything Has to Do with Hardness and Softness (1969)
2000s, 2003, A Vision for Iraq and the Iraqi people (March 2003)