Secret police are government agencies that operate in secrecy to monitor, investigate, and suppress dissent or opposition. They often use covert methods, such as surveillance and infiltration, to gather information on individuals or groups deemed a threat to the state. Their activities can include arresting political dissidents, censoring information, and enforcing state policies. These organizations are typically associated with authoritarian regimes, where they play a crucial role in maintaining control and stability. Examples of secret police include the KGB in the former Soviet Union and the Gestapo in Nazi Germany. Their actions can lead to widespread fear and human rights abuses.