Trading with the enemy

Trading with the enemy is a legal term of English origin that is used with a number of related meanings. It refers to:
 * 1) An offence at common law and under statute
 * 2) A ground for condemnation of ships in prize proceedings
 * 3) A ground for illegality and nullity in contract

United Kingdom
The statutory offence is now created by section 1 of the Trading with the Enemy Act 1939.