Task: Question Answering
Input (English): Passage: During the 1999 Russian Presidential elections, the two leading candidates are Igor Komarov, a former Colonel of the KGB, and Nikolai Nikolayev, a retired General of the Russian Army. When a car bomb explodes outside one of Komarov's pharmaceutical companies, and a virus is stolen from inside, an investigation by the FSB ensues headed by FSB agents Sonia Astrova and Andrei Kasanov. Their investigation is obstructed by the Director of the FSB, Anatoly Grishin.
A British Embassy worker from Moscow, Sir Nigel Irvine, tracks down Jason Monk, a former CIA operative, who ran double agents in the Soviet Union and convinces him to investigate the incident. Once in Moscow, Jason finds an old friend, Viktor Akopov, who agrees to hide Jason from Komarov's men. Viktor steals a residue sample of the bomb used and his scientist friend Tonkin tells him that the explosive used, Semtex H, has a direct traceable link to the FSB. Tonkin is soon killed by Vladimir Dorganosov, the man who attacked Komarov industries and stole the bioweapon.
Sonia and Andrei locate Leonid Zaitzev, a cleaner who worked at the Komarov Industries plant and saw Dorganosov steal the virus. As they question him, Grishin appears, arrests Zaitzev and fires Sonia and Andrei. Zaitzev is later killed by Dorganosov while in custody. Sonia goes home to find Jason waiting for her, and agrees to help him access the FSB network. However, they are shot at by Dorganosov, and a car chase ensues. They go to Andrei's house where they find him already dead.
After the chase, Dorganosov demands the rest of his payment from his contractor, who is revealed to be Anatoly Grishin. While they are arguing, Komarov himself arrives and orders Grishin to kill Dorganosov. 
Question: What's the job title of the person who fires Sonia and Andrei?
Output (English): Director of the FSB.