Discord over the TRUST Act, which limits when local authorities can detain unauthorized immigrants for federal agencies, is entering a new phase with the start of 2014. Supporters of the state measure are launching community-outreach campaigns, while opponents are redoubling their assertions that it rewards lawbreakers and usurps federal powers. The TRUST (Transparency and Responsibility Using State Tools) Act, which took effect Wednesday, is one of two such laws in the United States. The other, in Connecticut, went into effect on the same day, according to the National Conference of State Legislatures. California’s measure narrows the scope of Secure Communities,...