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Díaz moved to Spain after graduating from school and he worked with a group that was widely successful, La Pandilla, which had 4 boys and 1 girl (Mariblanca, now a Veterinarian in her home country), but after the La Pandilla members grew up, he moved back to Puerto Rico, and created Menudo. The group went to achieve world wide fame and success.
Díaz's formula of signing up new members at the age of 12 and changing them for new members once they reached 16, was the secret to Menudo's success, but it also proved troublesome, as sometimes, whenever an individual would leave the group, the millions of fans that individual might have made with Menudo, would leave too.
In 1991, Diaz was accused by ex members of Menudo of gay sex with Menudo members. In a May 1991 Univision Television Program "Cristina Show", he refuted the allegations.
Edgardo Díaz has stayed on top of the group from 1977 until now, from Menudo to the current M.D.O. among other things.
- ALISA VALDES-RODRIGUEZ (16 August 1999). "MENUDO'S BAD BOY RICKY MARTIN SINGS WHAT FELLOW ALUM ROBI ROSA WRITES". Sun Sentinel. p. 3D. Retrieved 11 January 2011.