Abstract: State special services are responsible for protecting the state from internal and external threats. Its objective is to maintain peace and stability so that state institutions can function properly and in accordance with the fundamental principles of a democracy, including, the rule of law, division of powers and respect for human rights. In order to carry out their mission effectively, special services are often invested with special powers enabling them, for instance, to gather otherwise inaccessible information, work in secrecy and use force legitimately. However, because of the power which they confer, these powers carry with them the risk of misuse or abuse. Wherever such risks become reality, security sector institutions deviate from their legitimate mission and threaten to undermine the democratically elected government which they are expected to serve. It is particularly important to carry out parliamentary oversight over special services of the state that excludes unlawful usurpation of power by security services. The article mainly aims to identify parliamentary supervision mechanisms over the activities of special services.