In Colombia (and I believe it applies to all Hispanic world) we use a different name convention that the one you're probably used to. We're named using this structure: First Name, Second Name, First Lastname, Second Lastname. read more
In this case Escobar is the paternal surname and Gaviria is the Maternal one. People are sometimes only referred to as by their forename and paternal surname (so he is called Pablo Escobar because his paternal surname comes first), and the longer version is left for more formal matters. My knowledge is limited to naming customs in Spain. read more
Later, as the conflict between Escobar and the governments of the United States and Colombia dragged on, and as the numbers of Escobar's enemies grew, a vigilante group known as Los Pepes (Los Perseguidos por Pablo Escobar, "People Persecuted by Pablo Escobar") was formed. read more
Pablo Escobar was famous for running the fearsome Medellin Cartel with an iron fist, but when it came to the business side of things, Gustavo Gaviria was where the buck stopped. read more