Please note

We've released the following endpoints within the Twitter API v2

v1.1 endpoints Corresponding v2 endpoints  
GET blocks/id 
GET blocks/list
POST blocks/create 
POST blocks/destroy
Blocks Migration guide
GET mutes/users/id 
GET mutes/users/list
POST mutes/users/create 
POST mutes/users/destroy
Mutes Migration guide

Please use the migration guides to see what has changed between the standard v1.1 and v2 versions.

Your app can mute, block and report users for the authenicated user.

For general information on reporting viloations on Twitter see How to report violations in the help center.