Five years ago, Cuban rapper Maykel “Osorbo” Castillo co-wrote a song called “Patria y Vida,” or “Fatherland and Life,” that became an anthem for the youth protests that rocked the island that year.

During his trial, it was revealed that Sean "Diddy" Combs was almost harmed by a knife-wielding inmate at the Metropolitan Detention Center in Brooklyn. Now, his former cellmate, Raymond Castillo, has ...