FORT WORTH, Texas — When Brittany Hughes walked her dog on a rainy afternoon last Sunday, she did not expect to see neo-Nazis flyers on the ground. The first one she found in her west Fort Worth neighborhood of Ridglea North was on Malvey Avenue, and she decided to leave it. She kept walking but found more, eventually collecting about 20 flyers on Locke and Kenwick avenues until her hands were cold and freezing wet. The flyers were in plastic bags containing dog food or rice, most likely to add weight for tossing from a car onto people’s front lawns. Messages included “Stop Illegal Immigration…