The focus of immigration raids has turned away from Los Angeles and shifted to Chicago and Minnesota but arrests in L.A. have continued, with federal agents deploying new tactics. Federal agents are moving faster, making it difficult for immigration activists to respond before the targets are whisked away, organizers and activists say. At a recent training session for 300 immigration activists in Los Angeles, the main topic was Minnesota and the changes to federal immigration tactics.For the last few months, federal law enforcement officers have intensified their efforts to locate and deport immigrants suspected of living in the country illegally....