NBA player Russell Westbrook talks to fans during an incident in Denver. (Getty Images)
Recent interactions illustrate the need to monitor crowds for potential misbehavior
Tennis pro Monica Seles was stabbed by a crazed fan of rival player Steffi Graf during a quarterfinal match in Hamburg on April 30, 1993, an incident that prompted a significant increase in security at major events like Wimbledon. More recently Jay-Z and Beyoncé were accosted by a

fan who jumped on the stage in August at ...

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