Federal

of or relating to the central government of a federation; "a federal district is one set aside as the seat of the national government"

characterized by or constituting a form of government in which power is divided between one central and several regional authorities; "a federal system like that of the United States"; "federal governments often evolved out of confederations"

national; especially in reference to the government of the United States as distinct from that of its member units; "the Federal Bureau of Investigation"; "federal courts"; "the federal highway program"; "federal property"

being of or having to do with the northern United States and those loyal to the Union during the American Civil War; "Union soldiers"; "Federal forces"; "a Federal infantryman"

a member of the Union Army during the American Civil War

any federal law-enforcement officer