In the movie The Godfather, when Michael proposed to kill the captain, Tom say that it's forbidden to kill a cop because otherwise all the police would turn against the family. So this is the fiction, in real life I know that Carmine Persico in 1987
ordered to Joel Cacace to kill William Aronwald Cacace arranged for brothers Vincent and Eddie Carnini to murder Aronwald. Cacace gave the two hit men a piece of paper with the name Aronwald on it. However, Aronwald's father, George Aronwald, was an administrative law judge and shared his son's office; the gunmen thought he was the target. On March 20, 1987, the Carinis shot and killed George Aronwald Senior in a laundromat near his home.

Furious at the Aronwald murder, the heads of the other New York "Five Families" demanded that the Colombos kill the Carnini Brothers. An enraged Cacace recruited Lucchese crime family member Carmine Variale and Bonanno crime family associate Frank Santora to eliminate the Carninis.In June 1987, both Carnini brothers were found dead in the back seats of their cars in Brooklyn.Concerned about the loyalty of his assassins, Cacace decided to murder them also. At the Carninis' funeral, Cacace allegedly pointed out Variale and Santora to a second pair of hitmen. In September 1987, Variale and Santora were murdered outside a Brooklyn social club in broad daylight. This extraordinary caution helped to temporarily conceal Cacace's involvement in the Aronwald murder.

Also in 1987, Cacace was involved in the unrelated murder of former New York Police Department (NYPD) officer Carlo Antonino.

On December 18, 2008, Cacace was charged with ordering the 1997 murder of New York Police Department officer Ralph Dols. According to the indictment, Cacace felt humiliated that Dols, a Latino, had recently married Cacace's ex-wife Kim.Cacace allegedly ordered Colombo capo Dino Calabro and soldier Dino Saracino to murder Dols. On August 25, 1997, Calabro and Saracino allegedly ambushed Dols outside his Brooklyn home and killed him.

So Cacace ordered to whack two policemen, and anything has happened, nor that the Colombo or the other families have said or done something.

I knew that at least in the American Mafia to kill a prosecutor or a cop was strictly forbidden, so I thought there are other cases in which the American Mafia has killed any politicians or cops?