There are also other US laws that apply worldwide. One, which is recently in the news, is a conspiracy to overthrow a government that the US is at peace with (it applies to all US citizens regardless of location). This conspiracy involves US citizens in an attempt to overthrow Laos communist government through supplying weapons as well as strategies for demolishing government buildings. The article is here:

http://news.yahoo.com/s/ap/20070605/...us/laos_plot_8