Communism is same as oligarchy as the in-party surrounding the dictator sucks wealth out of the stupid people who authorized theft to begin with. Just look at China.
No, communism is an economic form, oligarchy is a political form. A group could vote (democracy, political) to share the products of their labor freely with each other (communism, economic). The Yamagishi movement is an example of this. I am not advocating the Yamagishi movement, however.
I'm saying that whenever people vote to steal from any other people, their economic idealistic expectations will be usurped with political authoritarianism by any name. Oligarchy fits that foot....just look at China and it's rich upper class of party members.
A bit weak, looks line a crossing guard. If you need a Nazi salute done properly get a German. Germany surrendered in 1945..president 45 restarts the Reich.. Hmmm..
Open question: Throughout the Entire History of Humans, What organized method of governing has not descended to this state you outline which is ...leadership, hangers-on and bureaucrats suck wealth out of the people. Standard Operating Procedure right up there with Divide and Conquer. You got yer Makers and you got yer Takers. Blame the commies, the vatican, the fill in the blank, outcome different, let me know when, where and who pulled that off.