[GHFigs]

For the sake of background: people bring up the prospect of the death penalty for espionage often in these cases, but it's not something the US has actually invoked since WWII, even in very clear-cut situations where money changed hands or people died as a result.

For example: http://en.wikipedia.org/wiki/Noshir_Gowadia http://en.wikipedia.org/wiki/Robert_Hanssen http://en.wikipedia.org/wiki/Walter_Kendall_Myers http://en.wikipedia.org/wiki/Harold_James_Nicholson