These people will automatically get banned in Discord servers that have this feature enabled.
Only serious offenders will be added to this list, after a thorough confirmation of the offences.
If you'd like to figure out what their Discord handle is, copy the ID and surround it by "<@" and ">", so for example: <@123456897123546789>.
If you paste that into a Discord chat, you'll see what their username is.
Another way to verify who a user is, is to use Friendlybot's userinfo command.
You can use this by typing: -userinfo followed by the ID, for example:
-userinfo 123456789123456789
To enable this feature, type -universalban on
You can find the file with banned players here