They were Marxists. ;)
Many pure Marxists are not happy with the overall acceptance of Leninism and its acceptance within the dogma of Marxism-Leninism. The primary criticism by pure Marxists on Leninism is that Lenin was so flexible that it allows his followers to justify almost any policy by sifting through Lenin's various policies and finding one that suits a policy supported by Marxism-Leninism.
Lenin
Marxists Internet Archive was created in 1990.
In various times, places and contexts such supporters were known as Marxists, Bolsheviks, Mensheviks, Social Democrats and Communists and other names. This does not include the derogatory names.
Communist Party of Revolutionary Marxists was created in 1996.
Peter Struve founded (in 1905) and led the Constitutional Democratic Party in Russia. The Constitutional Democratic Party was known as the "KaDets" from the acronym of its name. They were liberals but not Marxists.
I don’t know about ‘pure Marxists’, but Marxists believe that capitalism inevitably involves exploitation, inequality and widespread poverty.
Pio
Marxists
There are no Marxists in the US government. There may be a couple Social Democrats here and there, but no Marxists.
Land to the peasants