You've alluded to this before. Would you be willing to expand n it?
Just a few people now and then butting in asking about evolution or religion in math class. .A bit disruptive but no more so than the anti-Vietnam-War groups did when I was in grad school. I would just point out that a math class was not the place for such discussions. I think these guys were just disruptive in general re everything.
Much disruption consisted in asking the same question over and over (different questions, some even about mathematics.)