Violence Against Umpires

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One and all:

I'm currently doing research on ways to prevent or punish anyone associated with violence towards sports officials. If anyone could point me towards websites, scholarly journals, or books associated with prevention/punishment for attacking umpires and referees in the sporting world, I would greatly appreciate the help. As an umpire myself, I know all to well the physical and verbal abuse umpires take on a daily basis. Any input, advice, or anything else you want to add, please do not hesitate. In general, I'm specifically looking into whether or not it would be more effective to educate parents, coaches, players on proper behavior, or if new laws with stricter penalties would work better to curb violence. Thanks for your time and input!