hunt for chapo-- his real name, joaquin guzman. , guzman was on the "forbes" magazine list of billionaires. he was also known to be one of the most violent drug traffickers in the world. as his sinaloa cartel fought to dominate the drug trade, the war between the cartels turned the southern side of the u.s.- mexico border into one of the most dangerous places on earth. >> maltz: thousands of people electrocuted, beheaded, chopping off limbs, throwing people in acid. he committed some ruthless crimes in mexico. >> whitaker: he's in custody now and doesn't look quite so ferocious-- cowed, his head bowed. but until he was apprehended by mexican marines, joaquin guzman, the illiterate son of a farmer, ran a multinational criminal empire. >> dinkins: they had not only transportation-- they had manufacturing, they had domestic and local distribution channels. >> maltz: very sophisticated-- with narco subs, with shipping vessels, with 747s, with private vessels, with tractor trailers, rail cars. the drug cartel was run like a... you know,