6 U.S. Code Chapter 1, Subchapter IV - DIRECTORATE OF BORDER AND TRANSPORTATION SECURITY
- Part A—Under Secretary for Border and Transportation Security (§§ 201–203)
- Part B—United States Customs Service (§§ 211–222)
- Part C—Miscellaneous Provisions (§§ 231–240)
- Part D—Immigration Enforcement Functions (§§ 251–257)
- Part E—Citizenship and Immigration Services (§§ 271–279)
- Part F—General Immigration Provisions (§§ 291–298)
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