A few years ago, there was an outfit called the Sindicato that was cracking down on police corruption -- we were told that we could call them if there was a problem.
When we were pulled over in San Quentin for an imaginary infraction, the policeman told me that the whole thing could be solved if I paid the fine to him on the spot. I speak fairly fluent Spanish -- I asked the policeman if he could call the Sindicato on his radio for me. He immediately waved us on.
I have not heard anything more about this Sindicato, so maybe it is no longer in operation?
Or it could also be that there was never any such thing as the Sindicato, and he was so confused by my bizarre question that he decided it would be too much trouble to deal with a crazy person. ;)