There is a new form of trolling in which bad actors are interrupting Hangouts Meet and Zoom meetings sharing offensive material, and disrupting meetings and classes. 
Here are a few suggestions for reducing the risk of this happening to your meeting or class.
Google Hangouts Meet
- Don’t post the link to your Hangout in a public place. Send it directly to your participants. 
 
- Know who you are allowing to join your Hangout before letting them in. 
 
- If someone does gain access to your Hangout, you can remove them. 
 
Zoom