"CDT today urged lawmakers to reject legislation that would force Internet speakers to place government-sanctioned warning labels on a broad range of online content. "Mandatory labeling of legal online content under threat of criminal sanction is ineffective, unwise, and unconstitutional," CDT wrote in a pair of letters sent to the leaders of the Senate Commerce and Appropriations Committees. The language has been attached to a major telecommunications bill and more recently to an appropriations package. As written, the provision would apply to a broad range of Internet content, and could force online publishers to tag legal, and often socially valuable, material with a "digital scarlet letter." CDT supports voluntary labeling efforts and has long endorsed the use of voluntary parental control tools such as filters."