In an unprecedented cooperative effort with governments, UN bodies and the International Committee of the Red Cross, Williams served as a chief strategist and spokesperson for the ICBL, which she developed from two non-governmental organizations (NGOs) with a staff of one – herself – to an international powerhouse of 1,300 NGOs in ninety countries.
Med en utrættelig indsats og tæt samarbejde med regeringer, FN-organer og Den internationale Røde Kors Komité fungerede hun som den centrale strateg og talsperson for ICBL, som hun arbejdede op fra at være to NGO'er med én ansat (hende selv) til at blive et internationalt kraftcenter for 1300 NGO'er i 90 lande.