Too many players in a team

Hey guys,

so I'm running a PvP server and one of my rules is a maximum team size of 5. I now discovered a group of six players.
Other than warn them and tell them to remove at least one player from the group - what else can I do?

It is a vanilla server so I don't really want to use any plugins to limit team sizes. But is it possible to somehow kick a player from that group or remove that group completely? Or even limit the group size without using a plugin?

Thanks

You can use the convar "relationshipmanager.maxteamsize <amount>" in your server console. Default is 8.