The great welcome that the recent FMI appointment for manager director have received in Spain and other countries, has contributed to the defence of this institution’s survival, notwithstanding that its work over 60 years have been hardly censured somewhere else. Thus, an analysis of this institution’s legitimacy is required, either in its formal shape and its material behaviour, as well as a study on the foundations of this naming. The very existence and evolution of FMI has its basis on questionable interests which turn aside the initial intentions declared and supposed as legitimating ones. A survey of big translational firms interests can be performed, specially of US ones, through the decision making and the defended positions of this multilateral organism. In such quantitatively important subjects as those contained in that agency, the “opinion” creation becomes a very profitable element.