Crusading newspaperman Rodolfo Acosta takes on 'the syndicate' in Tijuana after a young man goes berserk when the police try to arrest him for damage he's done while under the influence of marijuana. The syndicate promptly tries to shut him up, first by scaring off his advertisers, and then by any means they deem necessary.
The notes indicate the lead's character is based on a real-life newspaperman named Manuel Acosta Meza. A brief Google search could not turn up the individual. Apparently it's not that unusual a name.
The movie is a variety of the sort of movie like THE MIAMI STORY. It is a very sincere picture, but also obviously a cheap movie, with bare, simple sets. A few location sessions around Tijuana help, but despite its statement that the town was cleaning up, by the time I was there in 1971, it was pretty sleazy again.