Massive demonstrations� in� several� Arab� countries� lead to a civil war among the citizens. This is of special concern to the United� Nations� as� the� global� nature� of� international organizations� to� participate� in� the� intervention� of� the� conflict accompanied� by making� resolutions.� These cases are� suing� back the� legitimacy� of� international� law,� especially� international organizations� like� the� UN.� In� this� study� describes� about� the legitimacy� of� the� UN� Security� Council� resolutions,� and� thenapply� it� to� analyze� the� conflict� in� Darfur.� The� UN� is� an international� organization� which� is� the� subject� of� public international� law,� so� that� the� resulting� public� policy� becomes legally� binding� for� member� states� based� on� the� collective legitimation.� In� the� application� of� collective� legitimation� is� in practice� often does not� correspond to� the value of� morality� and even� a lot of� opposition� as in� the case of� the conflict in� Darfur whose governments� openly� reject the� contents of� the resolution issued by the United Nations.