The streets of Los Angeles rang with the sound of flash-bang grenades on Friday, as camouflage-clad federal agents rolled through the garment district in search of workers who they suspected of being undocumented immigrants. They were met with protesters, who chanted and threw eggs before being dispersed with pepper spray and nonlethal bullets.

By DAVID A. LIEB As President Donald Trump’s administration targets states and local governments for not cooperating with federal immigration authorities, lawmakers in some Democratic-led