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| Definition | : | National Security Letter |
| Category | : | Governmental » Security & Defence |
| Country/ Region |
: | United States
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| Popularity | : |
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| Type | : |
Initialism
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National Security Letter (NSL) is a letter request for information from a third party that is issued by the Federal Bureau of Investigation (FBI) or by other government agencies with the authority to conduct national security investigations.
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The full form of NSL is National Security Letter
National Security Letter | National Security League | National Student Lobby