Anti-immigrant backlash is nothing new, say sociology and criminology experts, who point to attacks against Irish, Italian and Polish immigrants about 100 years ago he profanity-filled text message called them “animals” and warned them to “be ready” for a militia gearing up to fight — because “everyone who hates illegals know where you live.” Jerson, a Venezuelan who came to Colorado in December, had been selling empanadas, arepas and Gatorade to people living in his apartment complex as they finished their work day, and he had included his phone number on the green poster-board menu that he hung in his...