USA
The title refers to the government's plan at the time for putting an end to a lucrative racket, kidnapping. When Hudson and Norris enter a country house to get out of the rain it turns out to be a kidnapper hideout. - IMDb
| Guerra sem Quartel |  Brazil |
| Guerra Sem Quartel |  Portugal |
| Guerra sin cuartel |  Spain |
| Das Haus im Nebel |  Austria |
| Ljudi bez milosti (literal title) |  Yugoslavia |
| Pas de pitié pour les kidnappeurs |  France |
| Show Them No Mercy (poster title) | USA |
| Show Them No Mercy! | USA |
| Sterminateli senza pietà |  Italy |
| Tainted Money |  United Kingdom |
| Thanatos stous gangsters (transliterated title) |  Greece |
| Zeig' kein Erbarmen! |  West Germany |
| 情無用ッ |  Japan |
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Jimmy Butler [14] | Boy at Service Station |
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Lynn Bari [15] | Crowd Scene Member |
