The Shiia believe that the Prophet Mohammed's son-in-law, Ali should have been the prophet's successor. His nickname was Haydar.
Best Guess: The Haydaryan will be fielded to apply force to maintain the Supreme Leader's position against rival clerics and to keep a close eye on the Islamic Revolutionary Guard.
I am personally surprised that the situation of the Supreme leader seems to be so vulnerable as to require the Haydaryan to be formed.
How do you think this will impact Iran's foreign policy decisions?