One really important way is by looking at the information that the MEK can gather from within the regime apparatus, including about things that are top secret, like Iran’s nuclear weapons program. 

The MEK, which supports a non-nuclear Iran, has disclosed information to the West on over 100 secretive nuclear projects in Iran. They gathered this information from MEK supporters working inside the government and the level of information they’ve been able to pass on shows that their infiltration of the Iranian regime must be extensive. 

Here is just some of the information on Iran’s clandestine nuclear program that the MEK revealed. 

In 2002, the MEK exposed the existence of two secret nuclear sites in central Iran – a fuel production plant in the city of Natanz and a heavy water plant in Arak. This led to a three-year investigation by the International Atomic Energy Association (IAEA), which determined the Iranian regime had concealed nuclear enrichment activities in violation of its Non-proliferation Treaty (NPT) obligations. 

In 2003, the MEK revealed that the Kalay-e Electric Company, which the regime claimed was a watch manufacturing company, was a secret centrifuge assembly and testing facility. Now, IAEA inspectors were banned from accessing the site for over a year, which allowed the regime plenty of time to destroy all evidence of its malign nuclear activities. 

When inspectors were allowed to enter the facility, their tests revealed trace amounts of enriched uranium, so the regime eventually acknowledged it had conducted enrichment research at the site. 

In 2008, the MEK revealed the existence of a new underground site controlled by the military, meaning its off-limits to IAEA inspectors, and close to the Natanz facility. The new site, located inside the Siah Kooh mountains, is connected to Natanz with a five-kilometer tunnel 

In 2015, the MEK revealed an underground nuclear research site, called Lavizan-3, which had been in operation since 2008 and is believed to be used to enrich uranium as well as build and test advanced centrifuges. As with the previous site, IAEA inspectors are denied access because it is located inside a military compound.  

The site, which is operated by Iran’s Ministry of Intelligence and Security (MOIS), is estimated by the MEK to hold up to 3,000 centrifuges. 

To be clear, the MEK supporters working inside the regime to bring down the mullahs from within are not just risking their jobs and prison. Like all MEK supporters in Iran, they are risking their lives, but no one could doubt that the regime will be especially harsh with those inside their ranks.