It's interesting how the US has wrongfully executed people, but no one seems to care. So basically in America you can get executed for committing no crime at all.
What about espionage and treason? They dont have to result in success (for example if their information is intercepted) for the accused for them to get the death penalty. They just have to commit those acts.
Even still, there are two or three people on the Federal death row for purely large scale drug trafficing convictions (no murder conviction etc.). As to whether they actually get executed is another matter.