Newbie: REST API incomplete? How do I

So IO understand that the XML and SOAP API’s are deprecated, and we should be using the REST API’s now.
I’m trying to find how to do the following tasks - and they don’t appear to be available in REST API? - So how do I do them?

  • remove user from group
  • remove user
  • delete a group
  • check if a user is active
  • rename a label
  • find/replace a label referenced in a macro

Are there any answers to these questions? (other than use RPC)

Don’t think to long about this: Just use the SOAP-API if there is no REST method available…