Joseph P. Bradley, Clark v. United States (95 U.S. 539…
“ Every man is supposed to know the law. A party who makes a contract with an officer without having it reduced to writing is knowingly accessory to a violation of duty on his part. Such a party aids in the violation of the law. We are of opinion, therefore, that the contract itself is affected, and must conform to the requirements of the statute until it passes from the observation and control of the party who enters into it. ”
