Could be kidnapping, could be money laundering.
There are a number of crimes that can extend across state lines.
Did the crime take place in a state? Do the states have extradition agreements? Can charges be brought in more than one state? Yes, yes, and yes. The FBI is a perfect tool for centralized gubment to access more power. Don't get me wrong, the FBI (as unConstitutional as it seems to me) does serve a common purpose in its crime fighting and intel gathering. I just think that it should be limited to international crime based in foreign locales. We have pleanty of local and state LEO agencies to take care of our domestic issues. The fed should take care of them (foreigners) commiting crimes against us (Americans).
EBUCK