Defence Regulation 18B

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Defence Regulation 18B, often referred to as simply 18B, was one of the Defence Regulations used by the British Government during and before the Second World War. The complete name for the rule was Regulation 18B of the Defence (General) Regulations 1939. It allowed the internment without trial of people suspected of being actively opposed to the ongoing war with Germany during World War II such as separatist elements (for example Irish republicans suspected of involvement in the Sabotage Campaign) or were otherwise suspected of ideological Nazi-aligned sympathy (this included members of the British Union of Fascists and similar groups). The effect of 18B was to suspend the right of affected individuals to habeas corpus.