2 toxic french players in European official servers keep team killing on purpose multiple people at random for no apparent reason and if you try to votekick them they will gang up on you with votekicks.
I also noticed that if they can't teamkill anymore because of revert back damage they'll just rejoin the server again.
They also seem to keep changing their name to impersonate other people so the new players think it's other innocent players teamkilling and not them.
They keep changing the Steam name all the time and are friends of each other.
Only got the chance to report one of them recently.