WASHINGTON — Nicole Hockley’s 6-year-old son Dylan was one of 20 first graders killed in the Sandy Hook Elementary School shooting that horrified the nation and ushered in the grim realization that America’s children might not be safe in their classrooms.

Hockley and other Sandy Hook parents turned their grief into activism to try to prevent the violence that claimed the lives of their loved ones. Hockley helped establish and is the CEO of Sandy Hook Promise, which breathed life into a movement spearheaded by victims of gun violence. The organization not only seeks to strengthen gun regulations, but it also lobbies for effective school safety policies and mental health and crisis intervention resources.

There have been dozens of school shootings since that massacre in Newtown, Conn., whi

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