The Security Information Service of the Czech Republic (BIS) is a counter-intelligence agency that operates within the territory of the Czech Republic. The agency is tasked with protecting citizens and the country from various threats, including terrorism and espionage from foreign states.

The Security Information Service achieves its mission by gathering and evaluating data related to risks that pose a threat to the country's security, democracy, and freedom. In fulfilling their mandate, the agency has been seen to take reactive measures in exposing threats against the nation.

In one such instance, in September 2023, BIS identified a Russian influence agent who was paid handsomely in euros to spread information promoting the foreign political interests of the Russian Federation, particularly in relation to the war in Ukraine. This identification happened upon the request from one of the highest bodies of Russian state power.

In addition to their counter-intelligence work, BIS is actively involved in tackling corruption within various sectors of the government. As an example, in May 2023 the agency recorded a leak of intentionally manipulated information from an investigation concerning criminal activity at the Ministry of Agriculture. The agency revealed this report as they have legal authority to protect significant economic interests from crimes such as corruption, serving to defend the nation's security and economic stability.

Overall, the Security Information Service of the Czech Republic plays a pivotal role in the nation's overall security framework, using intelligence tactics to expose foreign threats, as well as address internal issues such as corruption. The organization strives to maintain the safety, democracy and freedom of the Czech Republic and its citizens, by promptly responding to immediate threats and potential risks.