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Left-communists do nothing. It really is that simple.
Bordiga refused to get involved in opposition to the fascist regime in Italy, and in fact speculated that it'd be better if the Axis won World War II. Bordiga supported both Mussolini and Hitler in his writing. He also either informed on actual communists or was extremely friendly with fascist police informants, inviting them over to dinner and becoming drinking buddies with them.
After the war ended Bordiga claimed that the USSR, US and UK would become fascist states, thus "proving" anti-fascism is stupid. Meanwhile the PCI, which played a leading role in the anti-fascist resistance, enjoyed massive popularity among Italian workers and farmers to the extent the CIA intervened to help prevent a Communist victory at the polls
I can't think of a single left-com who actually did anything besides write, unless one talks about figures like Pannekoek or Pankhurst who were only relevant politically in the 1920s (and of these, Pankhurst later became a publicist for the feudal regime of Haile Selassie.)
There's a LeftCom comic called "Great Moments in Leftism" whose creator argues that even basic struggles like protesting cuts to welfare are reactionary because what workers should be protesting for is communism. Left-comms are almost always leftist in name only and obnoxiously sectarian to the point their ideologies borderline depend on dismissing other tendencies.
One can disagree with the Workers World Party, or the Freedom Road Socialist Organization, or the Party for Socialism and Liberation, or even the RCPUSA and CPUSA, but at least they actually have some following among students and/or workers. Anarchists and Trots also enjoy widespread support among the working class as well.
All left-coms have to offer are snide remarks and whining. Their ideologies are tailor-made to justify sitting on one's ass. They also all seem to write the same for some reason with lots of run-on sentences. The majority are also transphobic and/or class reductionist.
If you want a good laugh, ask one of them to coherently explain how they propose abolishing the commodity form. They will almost always start talking shit about the USSR instead :che-laugh: