Eric Holder's Justice Department is coming under pressure to order sweeping changes to police operations in the United States. Civil rights and community groups, as well as some lawmakers, are pushing the attorney general to take action to address racial and social problems that they say were exposed by the shooting of Michael Brown in Ferguson, Mo. “We’re at our zero moment as a nation,” said Maya Rockeymoore, president and CEO of the Center for Global Policy Solutions, a community-empowerment group. “If we continue to let this go unaddressed, we’re going to have Fergusons springing up all across the country.”...