# National Security Letters in Foreign Intelligence Investigations: Legal Background
> **Long Report (Legacy)** · 2015-07-30 · `RL33320`
## Report
- **CRS ID:** RL33320
- **Series:** Long Report (Legacy)
- **Publication date:** 2015-07-30
## Documents
- [PDF](https://www.everycrsreport.com/files/20150730_RL33320_3d55452283fba753738bc4f6821ac6edf650d973.pdf)
- [HTML](https://www.everycrsreport.com/files/20150730_RL33320_0445600d1325d9b49a6f60a036a9eed4814998bb.html)
---
*AI Analytics · CC0 1.0*