Federal charge means it either (a) happened in land under federal jurisdiction (borders, national parks, military bases, etc.), or (b) involved interstate comme

Federal charge means it either (a) happened in land under federal jurisdiction (borders, national parks, military bases, etc.), or (b) involved interstate commerce/transportation. Something being a felony has no relevance to whether it's a federal charge. You can have misdemeanor federal charges, as well as felony state charges.