As Licenser and Surveyor, L'Estrange was charged with the prevention of the publication of dissenting writings, and authorised to search the premises of printers and booksellers on the merest suspicion of dissension. L'Estrange excelled at this, hunting down hidden presses and enlisting peace officers and soldiers to suppress their activities. He soon came to be known as the "Bloodhound of the Press." His careful monitoring and control of nonconformist ideas and opinions succeeded not only in checking seditious publications, but also in limiting political controversy and reducing debate.