Everytown for Gun Safety has spent more than a decade building itself into one of the country’s most influential gun-control organizations. Founded in 2014 through the merger of Mayors Against Illegal Guns and Moms Demand Action, the organization has used political spending, litigation, research, and lobbying to advance stricter firearms laws. Its efforts have included campaigns for expanded background checks, restrictions on certain firearms, and laws allowing courts to remove guns temporarily from people deemed dangerous.