Critics warn that agents' tactic of masking spreads fear and panic across communities and imperils citizens as well as immigrants without legal status.

As federal immigration agents have ratcheted up enforcement raids, critics warn that their tactic of masking spreads fear and panic across communities.

LOS ANGELES — For many Angelenos, the spectacle of armed federal agents — faces hidden behind neck gaiters and balaclavas — jumping out of unmarked vans to snatch people off ...