The article examines the use of seditious libel and blasphemy as instruments of control during the era of Tory hegemony. It argues that the law of libel was a formidable instrument of repression, but one which was all but abandoned by the legal authorities because it proved to be too unreliable. On the one hand, it placed the writers and vendors of radical literature under the constant threat of prosecution. They could be perpetually threatened by ex-officio informations; they paid all legal costs accruing from their cases; and, if put to trial, they often faced a hostile judge and a packed jury. On the other hand, a great deal of arguably seditious literature circulated freely because the Home Office lacked the institutional means to embark on a policy of wholesale prosecution; enforcement of the libel laws was scattershot at best; and defendants ultimately managed to undermine the government's prosecutorial strategy by exploiting the flexibility of language to win acquittal in some well-publicized cases. Thus the profound uncertainty of libel proceedings made them double-edged weapons which often damaged the government and the accused at the same time.