On 16 August, 1819, at St Peter's Field, Manchester, armed cavalry attacked a peaceful rally of some 50,000 pro-democracy reformers. Under the eyes of the national press, 18 people were killed and some 700 injured, many of them by sabres, many of them women, some of them children. The 'Peterloo massacre', the subject of a recent feature film and a major commemoration in 2019, is famous as the central episode in Edward Thompson's Making of the...