“The Priestley Riots (also known as the Birmingham Riots of 1791) took place from 14 July to 17 July 1791 in Birmingham, England; the rioters’ main targets were religious Dissenters, most notably the politically and theologically controversial Joseph Priestley…
Priestley himself had written a pamphlet, An Account of a Society for Encouraging the Industrious Poor (1787), on how best to extract the most work for the smallest amount of money from the poor. Its emphasis on debt collection did not endear him to the poverty-stricken.”

http://en.wikipedia.org/wiki/Priestley_Riots#cite_note-12