- "Secret police" may have a different meaning when it is part of a longer noun compound: for example, "secret police operations" may mean "police operations which are secret".
Secret police (sometimes political police) are intelligence agencies and or police agency, law enforcement office which operates in secrecy and also quite often beyond the law to protect the political power of an individual dictator or an authoritarian political regime.
Instead of transparently enforcing the rule of law and being subject to public scrutiny as ordinary police agencies do, secret police organizations are specifically intended to operate beyond and above the law in order to suppress political dissent through clandestine acts of terror and intimidation (such as kidnapping, coercive interrogation, torture, internal exile, forced disappearance, and assassination) targeted against political enemies of the ruling authority.
Secret police forces are accountable only to the executive branch of the government, sometimes only to a dictator]. They operate entirely or partially in secrecy, that is, most or all of their operations are obscure and hidden from the general public and government except for the topmost executive officials. This semi-official capacity allows the secret police to bolster the government's control over their citizens while also allowing the government to deny prior knowledge of any violations of civil liberties.
States where the secret police wield significant power are sometimes referred to as police states or counterintelligence states. In theory, secret police differ from the domestic security agencies in modern liberal democracies, because domestic security agencies are generally subject to government regulation, reporting requirements, and other accountability measures.
Despite such overview, there still exists the possibility of domestic-security agencies acting unlawfully and taking on some characteristics of secret police. In some cases, certain police agencies are accused of being secret police and deny being such. For example, political groups and civil liberties organizations in the United States have at various times accused the Federal Bureau of Investigation of being secret police. Which government agencies may be classed or characterized, in whole or part, as "secret police" is disputed by political scientists.
A single secret service has the weapons to arrogate to itself complete political power. It may therefore pose a potential threat to the central political authority.
In dictatorships, a close relative of the dictator often heads the secret police. For example, Saddam Hussein, as head of the State Internal Security Department placed his secret police under the authority of his first cousin Ali Hassan al-Majid.
In addition, secret police have a strong tendency to view potential political enemies as concrete threats, even if they do not exist. In some cases, a dictator may manufacture such enemies for the purpose of directing national output toward a common goal, thereby supplying an image of national unity.
Methods and history 
Secret police not only have the traditional police authority to arrest and detain, but in some cases they are given unsupervised control of the length of detention, assigned to implement punishments independent of the public judiciary, and allowed to administer those punishments without external review. The tactics of investigation and intimidation used by secret police enable them to accrue so much power that they usually operate with little or no practical restraint.
Secret-police organizations employ internal spies and civilian informants to find protest leaders or dissidents, and they may also employ agents provocateurs to incite political opponents to perform illegal acts against the government, whereupon such opponents may be arrested. Secret police may open mail, tap telephone lines, use various techniques to trick, blackmail, or coerce relatives or friends of a suspect into providing information.
People apprehended by the secret police are often arbitrarily arrested and detained without due process. While in detention, arrestees may be tortured or subjected to inhumane treatment. Suspects may not receive a public trial, and instead may be convicted in a kangaroo court-style show trial, or by a secret tribunal. Secret police known to have used these approaches in history include the secret police of East Germany (the Ministry for State Security or Stasi) and Portuguese PIDE.
Secret police have been used by many types of governments. Secret police forces in dictatorships and totalitarian states usually use violence and acts of terror to suppress political opposition and dissent, and may use death squads to carry out assassinations and "disappearances". In times of emergency or war, a democracy may lawfully grant its policing and security services additional or sweeping powers, which may be seen or construed as a secret police.
Secret police agencies 
See also 
- Counterintelligence state
- Death squad
- Extrajudicial punishment
- High policing
- Intelligence agency
- Mass surveillance
- Central Intelligence Agency
- Federal Bureau of Investigation
- PROTECT AMERICA ACT OF 2007, PUBLIC LAW 110–55—AUG. 5, 2007 see section 105B(a)
- PROTECT AMERICA ACT OF 2007, PUBLIC LAW 110–55—AUG. 5, 2007 see section 105B(l)
- Hanrahan, Noelle. "America's Secret Police: FBI COINTELPRO in the 1990s", on Judi Bari Web Site of the Redwood Summer Justice Project". judibari.org.
- "Trust Us, We're the Government - ACLU Looks at Domestic Surveillance and the Need to Watch the Watchers in Times of Crisis | American Civil Liberties Union". Aclu.org. 2001-10-10. Retrieved 2012-06-19.
- Symposium - Nonviolent Civilian Insurrection in Iraq, Retrieved on October 29, 2007
- R. J. Stove, The Unsleeping Eye: A Brief History of Secret Police and Their Victims, Encounter Books, San Francisco, © 2003 ISBN 1-893554-66-X
- High Policing: The Protection of National Security
- MSNBC - Domestic spying vs. secret police
- Proposal for a Privacy Protection Guideline on Secret Personal Data Gathering and Transborder Flows of Such Data in the Fight against Terrorism and Serious Crime by Marcel Stuessi[dead link]