On this day, 3 April 1967 construction firm Myton, assisted by the police and the construction workers' union National Federation of Building Trades Operatives, attempted to bring in a scab workforce to replace unofficial strikers who were demanding reinstatement of victimised worker activists on the Barbican site in London. The strikers had been out for 6 months, and were threatened with expulsion from their union (which would also cost them jobs in closed shop sites). A union official who tried to support the workers was sacked by the union. Still the workers held out for over 7 more months against the employers, the unions and the police but were eventually forced to give in. 
More information and sources: https://stories.workingclasshistory.com/article/10152/myton-buses-in-barbican-scabs

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