Lenin used the phrase “infantile Left” to refer to some of his political opponents. What did he mean by that? What beliefs or practices would Lenin have characterized as “infantile”?
Probably members of the Party who believed that violence was not necessary to achieve the goals of Communisim.
But, that’s pretty much a guess.
One of Lenin’s most well-known works was “Left Wing Communism - an Infantile Disorder”. There is no shortage of translations available on the internet:
http://csf.colorado.edu/psn/marx/Other/Lenin/Archive/1920-lwc/
If you can get through the near-indigestible prose style laced with polemics, his main point seems to be that very doctrinaire “left” communists were infantile because they thought they should not participate in parliaments and other bourguiose institutions to achieve their ends. He believed them to be naive and childish because of their unwillingness to compromise, “on principle”, and unquipped to get on with the “real work” of the proletarian revolution.
I don’t want to give the impression that I’ve done more than scan the work, but that seems to be the gist of it.