USA
An average Los Angeles citizen witnesses a gang murder when he stops to use a telephone. Aware that he is the only witness against them, the gang members seek out his identity and terrorize him and his family to keep him from testifying against them. Only by psychologically playing one gang member against the others is the man able to bring the police to his rescue. - IMDb
| Rating | Percentage % | Votes |
|---|---|---|
| 10 | 0% | 0 |
| 9 | 100% | 1 |
| 8 | 0% | 0 |
| 7 | 0% | 0 |
| 6 | 0% | 0 |
| 5 | 0% | 0 |
| 4 | 0% | 0 |
| 3 | 0% | 0 |
| 2 | 0% | 0 |
| 1 | 0% | 0 |
| 1 |
| Avaintodistaja (informal title) |  Finland |
| Il cerchio della violenza |  Italy |
| Cuando el hampa dicta su ley |  Spain |
| L'homme qui a trop parlé |  France |
| Hovedvidnet |  Denmark |
| Key Witness |  United Kingdom |
| Key Witness | USA |
| Key Witness |  Canada |
| Martor cheie |  Romania |
| O kyrios martys katigorias (transliterated title) |  Greece |
| Le témoin silencieux | France |
| A Testemunha Chave |  Brazil |
| Testigo clave |  Mexico |
| Testigo clave |  Argentina |
| Vittnet |  Sweden |
| Die Wölfe von Los Angeles |  Austria |
| Die Wölfe von Los Angeles |  West Germany |
| 四人の恐迫者 |  Japan |
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Dennis Holmes [10] | Phil Morrow |
 |
Terry Burnham [11] | Gloria Morrow |
