Inappropriate interactions

I am offering free yoga classes via Zoom.  Three times now, I have had a person join and then be sexually inappropriate (nudity, exposure, and verbally) during the class.  Is there a way to track who logged into the class and block them from ever coming again?  I removed them from the class, but because I was on my mat, the other students were disrupted for the few seconds it took me to remove them.  Thoughts?  I speak to each person once they enter the Zoom room, ensuring they are in the right place and inquiring about their experience and needs.  These "crashers" start out sounding like they are truly interested in yoga. Thanks