Black Lives Matter Chicago and other social justice groups filed suit Thursday against several federal law enforcement agencies seeking to prevent agents deployed in Chicago by President Donald Trump from harassing and detaining protesters. The civil rights lawsuit filed in U.S. District Court comes a day after Trump said the federal officers would assist local police in reducing violent crime - and not form a camouflaged paramilitary strike force like the one that detained protesters in unmarked vans in Portland, Ore. recently. Trump, however, did not rule out a heavier-handed response in the future. “We know the authoritarian tactics they...