Washington -- As President Donald Trump and billionaire Elon Musk work to overhaul the federal government, they are forcing out thousands of workers with insider knowledge and connections who now need a job. For Russia, China and other adversaries, the upheaval in Washington as Musk’s Department of Government Efficiency guts government agencies presents an unprecedented opportunity to recruit informants, national security andintelligence experts say. Every former federal worker with knowledge of or access to sensitive information or systems could be a target. When thousands of them leave their jobs at the same time, that creates a lot of targets, as...