A counter-intelligence expert from Bulgaria is in Ireland and due to present his findings to the Bulgarian government next week.
The Security Service Bureau was established in 1909 to tackle counter-intelligence and threats to security in British territory, and was renamed MI5 in 1916.
Swiss counter-intelligence was very effective, too, and 387 spies, mostly Swiss but including 100 Germans, were captured and brought to trial of whom 17 were executed.
The Intelligence Corps also runs the ultra-secret counter-intelligence outfit the FRU, the Force Research Unit.
But at least it worked, which was important as the FBI had very little counter-intelligence capacity to begin with.
As one of the FBI's top counter-intelligence officers he earned $1.4m from Russia for his spying.
They could then test and refine their counter-intelligence strategy by monitoring how the US reacts.
The only thing everyone seems to agree on is that counter-intelligence was severely hobbled by the so-called ‘wall’ erected between the CIA and FBI.
There are biography and filmography profiles for Nicholas Lyndhurst and Clive Francis, and a short history of the MI5 counter-intelligence service.
Nevertheless, we still encounter failed religious and political homilies that fail our need for counter-intelligence and counter-terrorism.
In doing so we must remain mindful of the important fact that U.S. law distinguishes between domestic criminal law enforcement activity and foreign counter-intelligence and counter-terrorism activity.
Our counter-intelligence, which plays a considerable role here, is very fragmented.
Could the FBI even lose its own counter-intelligence division?
Since then, counter-intelligence tasks against domestic and foreign rivals have been prioritized over the bureau's other major duties, including investigation of violent crime, white-collar crime, and corruption.
Having used sex, drugs, money or alcohol to get a hold on someone, a counter-intelligence officer can then move on to blackmail when they want to put more of a squeeze on their supply of information.
In counter-intelligence, such specific details are not always available.
Cyber crime is even the U.S. Federal Bureau of Investigation's third highest priority, after counter-terrorism and counter-intelligence.
These doctrines address a range of concerns including ambush, spies, maneuver, counter-intelligence, mutiny and force protection.
The Australian Security Intelligence Organisation is responsible for internal security, for counter-espionage, for counter-intelligence and counter-terrorism.
This is especially so since there will always be more law-enforcement professionals in the FBI than intelligence and counter-intelligence operatives.