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Surveillance in example sentence

Following the September 2001 attacks in New York, and again after the bombings in Madrid in 2004 and London in 2005, law-enforcement authorities across Europe launched mass-arrest operations, undertook widespread surveillance of mosques, carried out stops and searches of people who appeared to be Muslim, and used other intrusive measures that disrupted the lives of – and in many cases humiliated – law-abiding European citizens.
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