Skip to page 68, "Appendix B," "Background" for information on U.S. role in instigating an anti-communist purge within Khomeini's administration: "In 1983, the U.S. helped bring to the attention of Tehran the threat inherent in the extensive infiltration of the government by the communist Tudeh Party and Soviet or pro-Soviet cadres in the country. Using this information, the Khomeini government took measures, including mass executions, that virtually eliminated the pro-Soviet infrastructure in Iran."