Who was the best spy in the 20th centery?

Question

Who was the best spy in the 20th centery?

Answer 1

If I told you, I'd have to kill you

Answer 2

Maxwell Smart

Answer 3

How would you define "best"?

If "best" means did the most damage to the country they spied on, then I would definitely say Julius and Ethel Rosenberg who worked to pass nuclear weapon secrets to the russians.

Klaus Fuchs could also be considered for the same reasons

Answer 4

If he or she was the best ,then we wouldn't know them . would we?

Did you hear about the 10th  annual Ninja parade in downtown LA.?  It was a great success , No one spotted a single one

How about Clinton , He gave nuclear technology to North Korea

Answer 5

The one that was never caught.

Answer 6

if they are the best we wouldnt know about them