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In fact, Bruce Schneier believes there's another, unknown NSA leaker besides Snowden: https://www.schneier.com/blog/archives/2014/08/the_us_intell...

It was already confirmed in the documentary CITIZENFOUR

That's the third leaker, not the second one.

1. Snowden

2. Unknown NSA leaker

3. Unknown National Counterterrorism Center (NCTC) leaker