Special police operations employed agents, informers, and spies. Trilisser specialized in tracing secret enemy informers and political spies inside the Bolshevik party. The militants have kidnapped and killed many civil servants and suspected informers. These missions include eavesdropping, interrogation, pickpocketing, and completing tasks for informers and fellow Assassins. Most of his work concerned London's criminal population of thieves, informers, gamblers and prostitutes. The IRA killed over 200 civilians as alleged informers in the conflict. Synagogues were often placed under police surveillance, both openly and through the use of informers. They were alleged to have abused payments to informers. IRA members who confessed to being informers were killed with a shot to the head. They decided to break into Cell Block 4, which held prisoners labeled as informers. However, the police records indicate a maximum of 300 paid informers. The bodies of alleged informers were usually left in public as a warning to others. The large numbers of Securitate informers made organized dissent nearly impossible. In the 1980s, the UVF was greatly reduced by a series of police informers. After the incident, Uday attacked 2 people who he thought were informers.