Protesters crowd the front of the Federal Building in Los Angeles to demonstrate against the Trump administration’s immigration enforcement. At a recent training session for 300 immigration activists in Los Angeles, the main topic was Minnesota and the changes to federal immigration tactics. (Carlin Stiehl / Los Angeles Times)A spokesperson from the Department of Homeland Security did not respond to The Times’ requests for comment. Local immigration activists say they have noticed a change in immigration agents’ tactics. Bovino led and participated in highly visible immigration operations in Los Angeles, Chicago, Charlotte, N.C., and Minneapolis, sparking outrage and mass demonstrations.