What gems can be used to block, unblock, remove users from a web application?

Question

Ruby on Rails

Hello.
Tell me the gems with which you can do all this, one person told me that it's easy to do with a gem, but I apparently searched badly on Google and did not find anything. What gems need to be connected to do this:
any user in the web application could delete block, unblock any other registered member?

Answer 1

CANCAN