Section 1 Introduction Early attempts at constructing an international law of sales actually began in the late 1920s with the work of the internationalinstitute for the Unification of private lawor UNIDROTT(统一私法国际研究所or国际 统一私法学会) an organization of European lawyers that was working closely with the League of Nations (国联)Section 1 Introduction Early attempts at constructing an international law of sales actually began in the late 1920s with the work of the International Institute for the Unification of Private Law or UNIDROIT(统一私法国际研究所 or 国际 统一私法学会), an organization of European lawyers that was working closely with the League of Nations （国联）