The Jamestown Foundation's Terrorism Monitor, 26 Nov 07:

If Iran's Revolutionary Guards Strike Back: The Case of Iraq
....The Fifth Column

The most significant advantage that the IRGC has in Iraq is the support of military operatives working within the U.S.-trained Iraqi police and army units in Baghdad and elsewhere. According to a former Iranian agent deployed during the Iraq-Iraq War, the IRGC’s operatives were fully embedded members of the Baathist army while collaborating with the Guard’s intelligence center. In a similar way, these military personnel, who have been entrenched in the Iraqi military and police force since 2003, can provide valuable information for the IRGC’s Qods Brigade. At the time of conflict between Iran and the United States, the task of the Qods Brigade would be to transfer critical tactical and military operations information from Iraq to the Committee on Foreign Intelligence Abroad (CFIA), an IRGC intelligence agency in Tehran.

Evaluating the Threat

The most dangerous development that could occur in the period prior to a military conflict between the United States and Iran is the development of an alliance between non-political Shiite organizations, like the Mahdi splinter groups, and the IRGC. The formation of such alliances could be prevented by encouraging the Iraqi government (with the possible assistance of al-Sadr and his militia) to find ways to locate, negotiate and incorporate these splinter groups into the Iraqi electoral process and governmental institutions. There is a further threat of acting on bad intelligence from Iranian sources like the terrorist group Mojahedin Khalq Organization (MKO), who may provide information to the coalition forces designed to expand a military conflict between the United States and Iran for their own political interests.....