---
kind: "unit"
title: "50"
title_heading: "War and National Defense"
key: "ch23"
level: "chapter"
label: "Chapter 23"
heading: "Internal Security"
release: "119-102"
url: "https://uscodex.org/usc/50/ch23"
sections_count: 27
---

# Chapter 23 — Internal Security

Title 50 — War and National Defense

## Contents

- [Subchapter I — Control of Subversive Activities](/usc/50/ch23-schI.md)
- [Subchapter II — Emergency Detention of Suspected Security Risks](/usc/50/ch23-schII.md)
- [Subchapter III — Personnel Security Procedures in National Security Agency](/usc/50/ch23-schIII.md)
- [Subchapter IV — Communist Control](/usc/50/ch23-schIV.md)
- [Subchapter V — Registration of Certain Persons Trained in Foreign Espionage Systems](/usc/50/ch23-schV.md)