| Original title | Uppdraget |
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| Danish title | Dobbelt forræderi |
| International titles | The assignment |
| Leikstjórn | Mats Arehn |
| Screenplay | Mats Arehn, Ingemar Ejve, Lars-Magnus Jansson |
| Based on | roman af Per Wahlöö. |
| Director of Photography | Lennart Carlsson |
| Editor | Ingemar Ejve |
| Composer | Allan Pettersson |
| Appearance | Christopher Plummer, Thomas Hellberg, Carolyn Seymour |
| Land | Sverige |
| Domestic distribution | Nordisk Films Kompagni |
| Technical info | 35 mm, Widescreen, Eastmancolor, Tone |
| Danish theatrical release | 04.11.1977 |
| Cinemas | Nygade |
Companies |
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| Production company | Svensk Filmindustri, Svenska Filminstitutet, Svenska AB Nordisk Tonefilm |
| Domestic distribution | Nordisk Films Kompagni |
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Instruktion |
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| Instruktion | Mats Arehn |
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Manus |
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| Manus | Mats Arehn |
| Manus | Ingemar Ejve |
| Manus | Lars-Magnus Jansson |
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Produktion |
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| Produktion | Ingemar Ejve |
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Foto |
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| Foto | Lennart Carlsson |
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Klip |
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| Klip | Ingemar Ejve |
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Musik |
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| Musik | Allan Pettersson |
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Kostumer |
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| Kostumer | Ulla-Britt Söderlund |
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Medvirkende |
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| Medvirkende | Christopher Plummer |
| Medvirkende | Thomas Hellberg |
| Medvirkende | Carolyn Seymour |
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