It's never been "in practice". Without the dictatorship of the proletariat, you do not have Marxism.

Marxism as put forth by Marx and Engels has several fatal flaws, one of which is the fact that nation-states exist and the cultural bonds between citizens of those states trumps any international sense of economic class, especially since "rich" and "poor" mean different things when one crosses borders. Marxism was never going to be a thing.

But state-sponsored Marxism...definitely was, and this was seen in Communist Russia, China and the Eastern Bloc. Then you had similar in-goal authoritarian states such as Fascist Italy and Nazi Germany that merely took the tops-down economic control and added an extreme racial/nationalistic flavor to it. And decided that instead of dissolving corporations that they were instead tools to be co-opted and used as engines of the state.

Harris is neither a Marxist, nor a communist, nor a fascist, nor an authoritarian. Her policies seem to be more pro-business than Biden's, in fact, but she still favors UHC and other left-leaning policies. And she favors democracy.

Harris' ideas for the economy are so nonsensical they defy being placed in a category. Suing companies for "price gouging" when their margins are 1-2% is...nonsensical, as I said. Her notions of "let's build everyone a house" and "let's give everyone x or y" or your typical collectivist tax-and-spend nonsense you see from democrats.

And she favors democracy when "democracy" favors her. Hillary!, one of the biggest slingers of disinformation ever, now favors people for spreading "disinformation".