USA
Niles and Carol Nelson are married doctors who save one of gang lord Gurney's men. Gurney exploits them, then kills Niles leaving Carol to take the fall. He next kidnaps writer Bill Stephens to write his biography. Knowing Bill will be killed when the biography is finished, Carol takes matters into her own hands. - IMDb
| Contra a Lei |  Portugal |
| Contra a Lei |  Brazil |
| Hommes sans loi |  Belgium |
| Hommes sans loi |  France |
| King of the Underworld |  Canada |
| King of the Underworld |  United Kingdom |
| King of the Underworld |  India |
| King of the Underworld | USA |
| Koning der onderwereld |  Netherlands |
| Kralj podzemlja (literal title) |  Yugoslavia |
| Król podziemia |  Poland |
| Mannen zonder wet | Belgium |
| O teleftaios ton gangsters (transliterated title) |  Greece |
| O vasilefs tou ypokosmou (reissue title) | Greece |
| Regele lumii interlope |  Romania |
| El Rey del hampa |  Spain |
| El Rey del hampa |  Mexico |
| El Rey del hampa |  Venezuela |
| Underverdenens Diktator |  Denmark |
| Den undre världens diktator |  Sweden |
| Unlawful | USA |
| Король преступного мира |  Soviet Union |
 |
Mickey Kuhn [6] | Young Boy |
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Sherwood Bailey [15] | Boy |
