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In the United States, a federal crime or federal offense is a crime that is made illegal by U.S. federal legislation. This includes many crimes that, if they did not occur on U.S. federal property or on Indian reservations, would otherwise fall under state or local law. Some crimes are listed in Title 18 of the United States Code, but others fall under other titles; for instance, tax evasion and possession of weapons banned by the National Firearms Act are criminalized in Title 26 of the United States Code.
The term "federal offence" has a separate meaning in Canada.
http://en.wikipedia.org/wiki/Federal_crime