Congress created the federal court system in the Judiciary Act of 1789, under the authority of Article III, Section 1 of the Constitution.
resistance to tyranny
The powers of the Federal government delineated in the US Constitution, give the federal government its duty to enforce Federal laws granted to it by the Constitution. If the powers not mentioned to belong to the Federal government, are left to the States.
Congress can levy income taxes.
The Federal Government has greater authority than individual states.