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In page Special Detective Unit:

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Oriel House was taken over and became a much-feared interrogation centre. The Oriel House team, about 80-strong, was made up entirely of ‘ex-British officers’ and was accused of using brutal interrogation techniques and of the assassination of republican suspects and prisoners. A study of the period concluded, 'Oriel House succeeded in its task of suppressing small scale republican activities in the Dublin area, not by the sophistication and efficiency its intelligence work... but by the more direct method of striking terror into its opponents.[3] They were disbanded after the Civil War: supposedly because of squeamishness on the part of Kevin O’Higgins; but a core was retained as G-division of the Dublin Metropolitan Police: the G-men, headed by ex-RIC Inspector David Neligan.