Why are Iranian regime officials afraid of the consequences of the new sanctions؟

Rudy Giuliani former mayor of New York City said referring to MEK supporters in the gathering.

The U.S. Senate voted almost unanimously on Thursday to pass new sanctions on Russia, North Korea and Iran.
The officials of Iranian regime are already afraid of the consequences of the new sanctions. In addition to economic implications of the sanctions, what worries them the most is the actions against the Islamic Revolutionary Guards Corps (IRGC) as a terrorist organization. Designating and imposing sanctions on the IRGC was long overdue because the IRGC serves as the guarantee to preserve the entirety of the regime ruling Iran and is the main entity responsible for domestic suppression, the export of terrorism and extremism, and obtaining weapons of mass destruction such as nuclear weapons and ballistic missiles.
The new bill has added to already shaky regime’s fears. Janati, the head of the Guardian Council announced on Thursday that the main issue which has preoccupied the Supreme leader is his concern over regime change. 
Regime change was the main topic of the July 1, 2017 annual gathering of Iranian resistance (The Mujahedin-e-Khalq or MEK) in Paris. Many speakers talked about the regime change and their support for the MEK.
“I’m happiest to be here because I can say, can probably say this with a good deal of authority, that the government of the United States supports you” Rudy Giuliani former mayor of New York City said referring to MEK supporters in the gathering.
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