# National Security Letters in Foreign Intelligence Investigations: A Glimpse at the Legal Background
> **Short Report** · 2015-07-31 · `RS22406`
## Report
- **CRS ID:** RS22406
- **Series:** Short Report
- **Publication date:** 2015-07-31
## Documents
- [PDF](https://www.everycrsreport.com/files/20150731_RS22406_97b18f40b1760e43b4f81340ac6c8b633576278d.pdf)
- [HTML](https://www.everycrsreport.com/files/20150731_RS22406_57c43ff1a050f3d912df66fd276fa95e40973f73.html)
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