Of all the lies that Edward Snowden has told since his massive theft of secrets from the National Security Agency and his journey to Russia via Hong Kong in 2013, none is more provocative than the claim that he never intended to engage in espionage, and was only a “whistleblower” seeking to expose the overreach of NSA’s information gathering. With the clock ticking on Mr. Snowden’s chance of a pardon, now is a good time to review what we have learned about his real mission.

Mr. Snowden’s theft of America’s most closely guarded...