One of the claims related to the PRISM scandal is that, regardless what NSA and other agencies assert, leaks are inevitable because of sheer number of people with access to secrets. According to this claim, 1.4 million Americans hold Top Secret clearance. Is that number accurate?
Example of such a claim:
Snowden had "top-secret" security clearance, which, somewhat stunningly, is something that more than 1.4 million people have (source)