WASHINGTON — Even before a former U.S. intelligence contractor exposed the secret collection of Americans’ phone records, the Obama administration was pressing a government-wide crackdown on security threats that requires federal employees to keep closer tabs on their co-workers and exhorts managers to punish those who fail to report their suspicions. President Barack Obama’s unprecedented initiative, known as the Insider Threat Program, is sweeping in its reach. It has received scant public attention even though it extends beyond the U.S. national security bureaucracies to most federal departments and agencies nationwide, including the Peace Corps, the Social Security Administration and the...