I am a Marxist-Leninist... aka communist/bolshevik/(derogaatory by ultra >leftists and liberals) tankie
I am a super strong avocate for 20th century Socialism
which is worker's state, centrally planned economy, means of production seized >by workers, and no markets
The problem with socialism/communism is that you can never create a society where everyone is 
equal when it comes to output and effort.  You will always have people who work harder and 
eventually they are going to realize that others are not working as hard as them, either because 
they are not able to or just don't, and those hard workers are eventually going to question why they 
are compensated at the same "rate" as others who are not as productive.
If it becomes too much of a problem, the authorities will likely vilify those who are more productive 
rather than those who are less so.  That happened in the USSR and, later, in East Germany where 
the more productive (who also usually owned more land or livestock) were heavily targeted by the 
government and party.  They are seen as free thinkers and a threat.  See dekulakization and 
classicide.  More recent examples include the Chinese reaction to the Hong Kong protests that 
were going on right before COVID-19 broke out and forced it out of our news cycles.
You also do not get rid of the "elite class" that ultimately lives off of others.  The USSR had party 
members and other "favorites" that still got to enjoy the finer things that the rest of the country 
was no longer able to without fear of reprisal.    See the nomenklatura. 
People always think they can do it better but, ultimately, communism and true socialism can only 
(maybe) work for societies (like communes) where the persons who are members are there 
voluntarily and who can leave easily if they decide they no longer want to be a part of it.  
Otherwise, there will eventually be certain conflict between those who put more into their work 
than others, and those who are able to curry favor with "the party" vs. others.
$$
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