Their name is correct, it's the 'mid' and 'western' marx institute (with this and a commenter pointing out ACP stands for Anti-Communist Psyop honestly I wonder how they pick their names lol).
We have some info on them here: https://en.prolewiki.org/wiki/Midwestern_Marx. follow the blue links to the names to read more afterwards. As a whole their 'institute' is basically tailist. The problem with tailism is eventually you stop tailing and just start following the reactionaries.
There's three guys in it, primarily.
Edward Smith is, there's not really any other way to put it, a midwit - to loosely reuse their name lol. Self-important clout chaser who thinks the following makes the theorist. His entire reason for living is that he peaked in high school when he was a wrestler, and since then has been trying to relive these glory days. He once posted this to Twitter:

Sorry for imposing this sight on you but that way you can see we have the receipts lol. It's in his prolewiki page, like I said you should read it afterwards it has a lot more info. Dude was posting thirst traps and trying to get some sympathy points by comparing himself to the GENOCIDE in Gaza.
Noah Krachvik is the second guy of this boy's club. His whole thing, having talked to him (against my will!) a few times on social media, is that he craves to be relatable and approachable. He talks in the most faux-reddit way, like I don't know how else to put it. Super online "Hello friendo!" shtick that just grates me to no end. Noah Krachvik is also not his real name but it's not that it's a pseudonym, he claims it's his real name like to the point he uses it for everything - e.g. he signed a Noah Krachvik signature onto the ACP constituting document. He is also known for posting pictures of run-down places that he says is "his neighborhood" but he's done it all over the country. Just a complete liar through and through, this guy is creepy as fuck honestly.
Carlos Guerrido/Guerrida (I always get it wrong not even making a joke lol) ~~has a PhD in philosophy from what I understand, or at least he says he does~~ (edit: he was a PhD student, but doesn't mention it anymore at all), and now that he doesn't know what to do with it, he charges people up to 80$ a head for a "marxism seminar" he was teaching (archive). He also sells books on the side. 80$ a pop, no possibility of financing or offering free seats.
He also writes books, that he sells of course - no copy is available unless you look on annas-archive and such. I opened one of his books that was recommended once just to see what was in it, and it opened with what you'd expect a philosophy major to write: deep as a puddle but wide as the ocean, he was seriously pretending Xeno's paradox of motion was some profound insight that not many people knew about, and wrote in the most complicated way possible to say some pretty basic stuff. Self-published and did not go through an editor, which is fine, but then why write a book? Why not make it into a blog article? Oh but you can't charge people 25 bucks for a blog... I'm trying to find the book but I need to look deeper.
Carlos' other claim to fame is that he is of Cuban origins, because as we all know, anyone who is ever born in AES is a saint and instantly born with the knowledge of dialectics into them.
Oh, they used to have Danny Shaw at the institute and the guy had a falling out with the ACP, because he was a nazi, and he didn't like that the ACP was not nazi enough.
So yeah that about sums it up