In Ah Sin v. Wittman, 198 U. S. 500, 25 S. Ct. 756, 49 L. Ed. 1142 (1905), the distinction is drawn between the right to use property for a lawful purpose and the claim of a privilege to visit a gambling house which the state, in the exercise of its police powers, could suppress at pleasure. It has never been held that one who is guilty of a crime cannot be punished merely because others equally guilty have not been prosecuted or convicted.