Whoa. I was a youth ref a long time ago in CT and the most I did was:
1 - a long loud whistle to stop play and go speak with coaches about a highly caffeinated dad at 7:45 in the morning, explaining that under 9 players slipping on dewy grass wasn't a foul, and "this isn't the world cup", and
2- walking over to a very demonstrative and boisterous coach and miming the actions "you", "no speak", "anymore"