During a PUG the player with the highest Karma may initiate a votekick by typing:
".votekick <Alias of person being kicked> <reason>"
.votekick Aluminati deliberately standing in his own molotov
If the player being kicked has the highest Karma then the player with the second highest Karma will be able to initiate the vote for them.
Players cannot be kicked once a team has 14 rounds won in order to prevent abuse at the end of the game. However, players can still report conduct policy violations after the game is over for offences after a team has 14 rounds won via a website ticket.
If you wish to dispute a votekick then please see the FAQ here.