There was a scratcher who removed a ton of people in my studio without my permission, how do I report him?

when backdrop switches to [Report v]

This guy had malicious intent, but there is no way to stop him.
And this studio doesn't have like, 10 followers it's this studio: https://scratch-mit-edu.ezproxyberklee.flo.org/studios/36151058/

Considering that you're the host of the studio, remove his manager status and add said people back.

That being said, it might be good to use Contact Us.

K, but I was hoping there was a simpler solution… thanks!

As far I know, he doesn’t risk anything from ST, by making him manager, you give him your trust. The only thing you can do is what MudkipKappa said

Ok, thanks!