THE world has reached a "major milestone" in the drive to combat modern slavery after Sudan became the fiftieth country to back a United Nations treaty against forced labour, the International Labour Organization (ILO) has said. The legally binding 2014 pact - a protocol to the 1930 ILO Forced Labour Convention - compels nations to enact measures to prevent forced labour, protect victims and provide compensation. The ILO - with the International Organisation of Employers (IOE) and the International Trade Union Confederation (ITUC) - has led the "50 for Freedom" campaign to encourage governments to ratify the protocol and raise…