| Original title | The purple gang |
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| Danish title | Storbyens sjakaler |
| Leikstjórn | Frank McDonald |
| Screenplay | Jack De Witt |
| Director of Photography | Ellis Carter |
| Editor | David Milton |
| Composer | Paul Dunlap |
| Production designer | David Milton |
| Appearance | Barry Sullivan, Robert Blake, Elaine Edwards |
| Land | USA |
| Domestic distribution | Alliance Film |
| Technical info | 35 mm, Normal, Sort-hvid, Tone |
| Danish theatrical release | 23.03.1971 |
Companies |
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| Production company | Allied Artists Pictures Corporation |
| Domestic distribution | Alliance Film |
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Instruktion |
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| Instruktion | Frank McDonald |
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Manus |
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| Manus | Jack De Witt |
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Produktion |
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| Produktion | Lindsley Parsons |
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Foto |
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| Foto | Ellis Carter |
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Klip |
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| Klip | David Milton |
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Musik |
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| Musik | Paul Dunlap |
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Produktionsdesign |
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| Produktionsdesign | David Milton |
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Medvirkende |
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| Medvirkende | Barry Sullivan |
| Medvirkende | Robert Blake |
| Medvirkende | Elaine Edwards |
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