Question:medium

The doctrine of civil conspiracy was enunciated by the House of Lords in

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For the tort of conspiracy, remember the distinction made by the cases: In \textit{Mogul Steamship}, the purpose was legitimate self-interest. In \textit{Quinn v. Leathem}, the purpose was to injure. The predominant purpose is the key factor in determining liability for conspiracy.
Updated On: Jul 13, 2026
  • Walsby v. Anley
  • Moghul Steamship Company v. Mc. Gregor Gow and Company
  • Allen v. Flood
  • Quinn v. Leathem
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The Correct Option is D

Approach Solution - 1

The doctrine of civil conspiracy turns on the predominant purpose test, and only one of these cases actually applied it to impose liability.

  1. Moghul Steamship: The combination here was found not liable, because its predominant purpose was legitimate trade competition, so this case sets a boundary on the tort rather than establishing liability under it.
  2. Allen v. Flood: Involves a single individual, not a combination of persons, so it falls outside the scope of a conspiracy claim altogether.
  3. Walsby v. Anley: Not connected with the tort of civil conspiracy.
  4. Quinn v. Leathem: The House of Lords found the trade union officials liable here, because their predominant purpose was to injure the butcher rather than advance any legitimate interest of their own, this is the case that actually enunciates and applies the doctrine.

Since only this case results in liability being imposed for a conspiracy to injure, the correct answer is Quinn v. Leathem.

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Approach Solution -2

Tracing the chronological development of this line of House of Lords cases shows how the doctrine took shape and where it was finally settled.

  1. Mogul Steamship Co. v. McGregor, Gow & Co. (1892): The starting point, holding that combining to protect one's own trade by lawful means is not actionable, even if it harms a competitor.
  2. Allen v. Flood (1898): Extended the reasoning to individual action, holding that even malicious individual conduct causing harm is not actionable if the means used are lawful.
  3. Quinn v. Leathem (1901): Distinguished from both earlier cases because here there was a combination of persons whose predominant purpose was found to be injuring the plaintiff, not advancing any legitimate interest of their own, and the House of Lords held them liable in conspiracy. This case is where the doctrine of civil conspiracy was actually applied to fix liability, marking it as the case that enunciated the doctrine in its operative form.

Following the line of authority to where liability was actually established points to the same case.

Therefore, the correct answer is Quinn v. Leathem.

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