Safer World is a project of the Nuclear Threat Initiative (NTI). The NTI mission is "to strengthen global security by reducing the risk of use and preventing the spread of nuclear, biological and chemical weapons." Safer World calls for public assistance "to keep nuclear, biological and chemical weapons out of the hands of terrorists."  
Safer World's web site provides a downloadable brochure and TV ads, as well as an interactive "Action Center" for the public to signup to endorse/support Safer World/NTI principles, join an e-mailing list, "Question the Candidates," and to "Stay Informed."
Nuclear Threat Initiative
1747 Pennsylvania Avenue NW, 7th Floor
Washington D.C. 20006
Email: contact AT nti.org