The ARCOS Raid was a three-day search of the All Russian Cooperative Society's premises in Moorgate, London by 200 police officers in 1927, forming the climax of an attempt by Assistant Commissioner Wyndham Child of Scotland Yard to outlaw the Communist Party of Great Britain. The raid was intended to prove the Trade Mission was involved in espionage by finding marked secret papers which were 'allowed' to go missing from the War Office. The search failed to find the missing War Office papers. Research ARCOS Raid
 
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