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An 8-panel Phoebe Teaching Joey meme.
The first panel is Phoebe from Friends saying "Russia".
The second panel is Joey from the same show replying with "Russia".
The third panel is Phoebe saying "has invaded".
The fourth panel is Joey repeating back "has invaded".
The fifth panel is Phoebe saying "Ukraine".
The sixth panel is Joey repeating back "Ukraine".
The seventh panel is Phoebe saying the completed phrase "Russia has invaded Ukraine".
The final panel shows Joey proudly proclaiming "NATO just started a proxy war".
That's actually Leninist theory, Marx never went that direction. And Lenin was the one who betrayed the revolution to seize power, followed by a true despot in Stalin.
The actual origin of the terms Left and Right go back a bit further than Marx, they go back to the French Revolution. There was a vote, the question was, "Should the king have an absolute veto over new laws passed by the assembly" Those who said yes sat on the right of the podium, those who said no sat on the left.
Those on the left wanted no king at all, they wanted the people to have the power.
Communism was only deemed a left-wing ideology because the people held the power, not the wealthy few.
As a note, conservatism was also created out of the French Revolution, as a sort of blowback against it. It uses wealth to create and enforce social hierarchies.
Anyway, once you've betrayed the revolution and installed a dictator, communism is not considered left-wing, it's a tool of authoritarianism, where the king owns all and merely allows the peasants to live in his kingdom.