https://techcrunch.com/2021/10/22/google-meet-rolls-out-new-audio-and-video-locks-for-hosts/

Google Meet is getting new audio and video locks to let hosts turn off the microphones and cameras of other participants. The new feature essentially lets you mute a user and prevent them from unmuting themselves until you unlock them.

Earlier this year, Google rolled out the ability for hosts to mute everyone all at once in a group call. This latest feature takes the move a step further by preventing participants from unmuting themselves at any point during the call.