A new coalition of celebrities and activists, including actor Alyssa Milano and Parkland student David Hogg, announced plans Friday to take on the National Rifle Association and elected officials who accept money from the powerful gun advocacy group. In an open letter to NRA Executive Vice President Wayne LaPierre, which was first obtained by TIME, the more than 100 members of the newly formed NoRA Initiative — short for No Rifle Association — pledge to reduce the NRA’s influence in American politics through a series of voter registration drives, nationwide art campaigns, demonstrations and boycotts. “Your time signing checks in our blood is up,” the letter says.