A crime? Against whom? Who was injured? How is there a crime with no victim?
I started to address this but decided that you couldn't possibly be serious.
What oath did Snowden make?
He signed several specific non-disclosure agreements when he was granted access to sensitive and classified information. I can dig through my official papers and try to scan one for you, but it'd probably be easier for you to just google a blank one. They spell out, in detail, what is expected of those entrusted with state secrets, and outline possible penalties.
Interesting note that I just read at WaPo. Supposedly seven of the nine so-called "whistleblowers" who have been prosecuted under the Espionage Act of 1917 have been charged since 2009.