A clandestine cell system is a method for organizing a group of people, such as resistance fighters, sleeper agents, mobsters, or terrorists, to make it harder for the police or military to catch them. In a cell structure, each of the small groups of people in the cell know the identities of the people only in their own cell. Thus any cell member who is apprehended and interrogated (or who is a mole) will not likely know the identities of the higher-ranking individuals in the organization.
The structure of a clandestine cell system can range from a strict hierarchy to an extremely distributed organization, depending on the group's ideology, its operational area, the communications technologies available, and the nature of the mission. Criminal organizations, undercover operations, and unconventional warfare units led by special forces may also use this sort of organizational structure.
Covert and clandestine operations are not the same when it comes to tradecraft. The modern NATO definition of a covert operation says the identity of the sponsor is concealed, but in a clandestine operation the operation itself is concealed from the participants. Put differently, clandestine means "hidden", and covert means "deniable"—that is to say that the sponsor of a covert action is sufficiently removed from it that the sponsor can claim ignorance in the event the plot is discovered.
A sleeper cell refers to a cell, or isolated grouping of sleeper agents, that lies dormant until it receives orders or decides to act.
In World War II, Operation Jedburgh teams were formed to lead unconventional warfare against German units by acts of sabotage and leading local resistance forces. They also acted as a liaison between Allied command and the resistance units. They were composed of two officers – one American or British, and the other a native to the area they would operate, preferably from the area into which they landed – and a third member who was a radio operator. They operated in France and the Netherlands and similar teams operated in South East Asia.
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A clandestine operation is an intelligence or military operation carried out in such a way that the operation goes unnoticed by the general population or specific enemy forces. Until the 1970s, clandestine operations were primarily political in nature, generally aimed at assisting groups or nations favored by the sponsor. Examples include U.S. intelligence involvement with German and Japanese war criminals after World War II. Today these operations are numerous and include technology-related clandestine operations.
Tradecraft, within the intelligence community, refers to the techniques, methods, and technologies used in modern espionage (spying) and generally as part of the activity of intelligence assessment. This includes general topics or techniques (dead drops, for example), or the specific techniques of a nation or organization (the particular form of encryption (encoding) used by the National Security Agency, for example). Agent handling is the management of espionage agents, principal agents, and agent networks (called "assets") by intelligence officers, who are typically known as case officers.
A dead drop or dead letter box is a method of espionage tradecraft used to pass items or information between two individuals (e.g., a case officer and an agent, or two agents) using a secret location. By avoiding direct meetings, individuals can maintain operational security. This method stands in contrast to the live drop, so-called because two persons meet to exchange items or information. Spies and their handlers have been known to perform dead drops using various techniques to hide items (such as money, secrets or instructions) and to signal that the drop has been made.
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