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That has happened with (to my knowledge) every communist nation out there, from USSR to Cuba.
Similarly, that has already happened with the capitalist US: corporate interests over those of people, and the interests of the rich over everyone else; at times, it's something like the plot right out of a Deus Ex game: https://youtu.be/_fHfgU8oMSo .
Honestly, the same is also probably happening with the more socialist leaning EU, at least based on how many stories about corruption and bribes one hears on the news in my country, not even thinking about the same on a grander scale.
I don't really have any solutions to offer or ideologies to push and i'm not sure whether individuals being politically active is (always) even that effective, just look at Russia and how many people there are in prisons, or how polarized everything is in US with identity politics.
All i can say for sure is that humans and human nature are the common denominator in every single one of those systems, in which the reality eventually differs from the theory behind them.
If you're interested in that doing that, i'm sure that there are places online that try to document the various injustices (here's a US centric one https://www.reddit.com/r/Keep_Track/top/?t=all though probably also biased due to the political polarization) as well as historical writings about the exposed problems in the communist countries of the old days. If anyone has any good ones, feel free to link them, because aside from the actual argument, i'm also curious.
Personally, in regards to the modern day world, i'd say that stealing 400 billion from taxpayers is pretty bad, which is one colorful example in recent memory: https://www.huffpost.com/entry/the-book-of-broken-promis_b_5...
Of course, in my day to day life, it really doesn't matter whether that's 40 or 400 billion, because i will hardly ever even make a million myself (living in the EU, at my current salary it would take me 49 years of work, aside from inflation, salary increases etc.). Not to say that it's not important to talk about these things, just that the scales at play are so mindbogglingly huge that they are hard to even reason about.