---
kind: "section"
citation: "19 U.S.C. § 4631"
title: "19"
title_heading: "Customs Duties"
number: "4631"
heading: "Definitions"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/19/4631"
units:
  - "Chapter 29 — United States–mexico–canada Agreement Implementation"
  - "Subchapter VI — Labor Monitoring and Enforcement"
---

# §4631. Definitions


In this subchapter:

- (1) **Labor attaché—** The term “labor attaché” means an individual hired under part B.
- (2) **Labor obligations—** The term “labor obligations” means the obligations under [chapter 23](/usc/19/chch23.md) of the [USMCA](/usc/19/4502.md?p=9) (relating to labor).
- (3) **Mexico’s labor reform—** The term “Mexico’s labor reform” means the legislation on labor reform enacted by Mexico on May 1, 2019.

## Source credit

(Pub. L. 116–113, title VII, § 701, Jan. 29, 2020, 134 Stat. 80.)