CHAPTER 6—IMMIGRATION (§§ 100,_101—241_to_246)
- SUBCHAPTER I—IMMIGRATION AND NATURALIZATION AGENCIES, OFFICERS, AND STATIONS (§§ 100,_101—117,_118)
- SUBCHAPTER II—REGULATION AND RESTRICTION OF IMMIGRATION IN GENERAL (§§ 131—175_to_181)
- SUBCHAPTER III—QUOTA AND NONQUOTA IMMIGRANTS (§§ 201_to_204—239)
- SUBCHAPTER IV—ALIEN VETERANS OF WORLD WAR I (§ 241_to_246)