What they described to Hughes was an extensive intelligence-gathering network that the British had developed around Belfast. The centrepiece of the operation was a laundry service, with an office in the city centre. Four Square Laundry operated an actual door-to-door laundry service, picking up clothing and linens and then subcontracting to an industrial laundry in Belfast to wash the clothes. But before they got there, the clothes were analysed by British authorities. Traces of explosives could be detected on garments in order to determine whether bombs were being made or stored at a
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