ALBANY, N.Y. — At an event in the Adirondacks last week, Gov. Andrew Cuomo recounted a treasured memory of the time his family retrieved an eagle feather from Saranac Lake and kept it after one of the beautiful birds swooped near his canoe. In telling the story, the New York Democrat was unknowingly confessing a crime. A federal law prohibits non-Native Americans from possessing bald eagle parts, including feathers. The law has been on the books for nearly 80 years, but most Americans, Cuomo included, probably don’t know about it. Cuomo, a lawyer and former federal official, revealed his legal...