SPY1S2_190507_368
Existing comment:
Tricking Terrorists: The Four Square Laundry

Bombs rocked Belfast in the 1970s. They were planted by the Irish Republican Army (IRA), a terrorist group fighting to make Northern Ireland independent from British rule. Yet there were IRA sympathizers in Belfast; some hid militants in their homes. How could the British Army find those terrorist hideouts?

IRA bombmakers used an explosive material that left traces on clothing -- until the clothes were washed. So British undercover agents created the Four Square Laundry, collecting dirty washing from IRA neighborhoods to literally sniff out suspects.
Proposed user comment: