“It’s now come to our doorstep,” Mello said. “In a building where everyone should feel comfortable, it saddens you that people have to be worried violent protesters might be outside.” About 20 neo-Nazis shouted at adults and children as they arrived Dec. 10 for Drag Story Hour, a library event in which volunteers who are dressed in drag read books to children. The readers were denounced as pedophiles. Antisemitic slurs were hurled at an adult there wearing a yarmulke. And protesters flashed the Nazi salute. FALL RIVER — David Mello leads the children’s section of the 19th-century library in the...