Since 1987, U.S. agencies have implemented numerous sanctions against Iran. First, Treasury oversees a ban on U.S. trade and investment with Iran and filed over 94 civil penalty cases between 2003 and 2007 against companies violating the prohibition. This ban may be circumvented by shipping U.S. goods to Iran through other countries. Second, State administers laws that sanction foreign parties engaging in proliferation or terrorism-related activities with Iran. Under one law, State has imposed sanctions in 111 instances against Chinese, North Korean, Syrian, and Russian entities. Third, Treasury or State can use financial sanctions to freeze the assets of targeted parties and reduce their access to the U.S. financial system.