Taxes on knowledge was a slogan defining an extended British campaign against duties and taxes on newspapers, their advertising content, and the paper they were printed on. The paper tax was early identified as an issue: "A tax upon Paper, is a tax upon Knowledge" is a saying attributed to Alexander Adam (1741–1809), a Scottish headmaster.

The Rotunda radicals, known at the time as Rotundists or Rotundanists, were a diverse group of social, political and religious radical reformers who gathered around the Blackfriars Rotunda, London, between 1830 and 1832, while it was under the management of Richard Carlile. During this period almost every well-known radical in London spoke there at meetings which were often rowdy. The Home Office regarded the Rotunda as a centre of violence, sedition and blasphemy, and regularly spied on its meetings.