The three letters which date back to 1985 were sent to the Soviet Union and the communist party 4 years after Rajavi escaped to France. A copy of each letter can also be found in Stanford University's archives.

In these letters, Rajavi and Farhad Olfat, an MKO (MKO, also known as MEK, PMOI and NCRI) representative, have demanded to Soviet Union $300mln aid and granting asylum to the MKO members who had fled Iran.

But what attracts attention in these letters, is Rajavi's crystal-clear confession that he had ordered the killing of over 10,000 Iranians across the country which proves Tehran's claims that the MKO has killed over 12,000 Iranian people, FNA reports.

The MKO terrorist group started assassination of the citizens and officials after the revolution in a bid to take control of the newly-established Islamic Republic.

It killed several of Iran's new leaders in the early years after the revolution, including the then President, Mohammad Ali Rajayee, Prime Minister, Mohammad Javad Bahonar and the Judiciary Chief, Mohammad Hossein Beheshti who were killed in bomb attacks by the MKO members in 1981.

The group fled to Iraq in 1986, where it was protected by Saddam and where it helped the Iraqi dictator suppress Shiite and Kurd uprisings in the country.

The terrorist group joined Saddam’s army during the Iraqi imposed war on Iran (1980-1988) and helped Saddam and killed thousands of Iranian civilians and soldiers during the US-backed Iraqi imposed war on Iran.

Since the 2003 US invasion of Iraq, the group has been strongly backed by neo-conservatives in the United States, who argued for the MKO to be taken off the US terror list.

The US formally removed the MKO from its list of terror organizations in early September, one week after Secretary of State Hillary Clinton sent the US Congress a classified communication about the move. The decision made by Clinton enabled the group to have its assets under the US jurisdiction unfrozen and do business with the American entities, the State Department said in a statement at the time.

In September 2012, the last groups of the MKO terrorists left Camp Ashraf, their main training center in Iraq's Diyala province. They have been transferred to Camp Liberty. Hundreds of the MKO terrorists have now been sent to Europe, where their names were taken off the blacklist even two years before the US action.

The MKO has assassinated over 12,000 Iranians in the last 4 decades. Some 17,000 Iranians have lost their lives in terror attacks in the 37 years after the Revolution.