A federal form of government is one in which a central authority holds all power. The president can hold acts of Congress and of the courts unconstitutional. Congress can regulate any activity that substantially affects commerce. A state law that substantially interferes with interstate commerce is unconstitutional. When there is a direct conflict between a federal law and a state law, the federal law is invalid. If a tax is reasonable, it is within the federal taxing power. The Bill of Rights protects individuals against various types of interference by the federal government only. Any restriction on commercial speech is unconstitutional. Due process and equal protection are different terms for the same thing. The First Amendment protects individuals from speech that violates state criminal laws