Robbery is a state crime for the most part, but certain types of robberies fall under federal jurisdiction. The first kind of federal robbery is a bank robbery. Any robbery or attempted robbery of a bank, credit union or savings and loan institution constitutes a federal crime.
The federal government also has jurisdiction over robberies that affect articles in the stream of interstate commerce. The most common example of this is the hijacking of a truck full of goods being shipped from one state to another.