The Society for Constitutional Information was a British activist group founded in 1780 by Major John Cartwright, to promote parliamentary reform. It was an organisation of social reformers, many of whom were drawn from the rational dissenting community, dedicated to publishing political tracts aimed at educating fellow citizens on their lost ancient liberties. It promoted the work of Tom Paine and other campaigners for parliamentary reform. Most members of the Society for Constitutional Information were also opposed to the slave trade. It was particularly strong in Sheffield.