Arthur Douglas has been passionate about guns his entire life. He spent his childhood hunting, then amassed a treasured collection of firearms, including antique rifles he considers priceless. For years, he’s worked as a firearms instructor for the National Rifle Association and the U.S. Concealed Carry Association.

But the 61-year-old building contractor was incensed to learn from ProPublica that his name, age, New Hampshire address, phone number and registered voting status were in a database compiled by the gun industry’s chief lobbying group to help friendly politicians win elections.

Douglas is one of millions of people whose sensitive personal information was compiled over two decades by the National Shooting Sports Foundation, working with some of America’s most iconic gun-makers and retailers. As ProPublica previously reported, the industry group assembled data on this collection of gun owners and others without their knowledge or consent to persuade them to vote in the industry’s interests. The NSSF credited the campaign with landmark victories that vanquished gun control efforts.