Years ago, I read a book written by a retired FBI agent concerning the life of of one of Chicago's longest reigning Outfit guys.
The agent-author is Fred Roemer, the subject is Tony Accardo, and the book is:
"Accardo: The Genuine Godfather".
In the book the author describes a scene where in the early '70's an overzealous FBI field agent threatened Accardo's son, during a discussion that took place between the over-hyped agent and Accardo's wife in front of Accardo's house. Tony Accardo was not present in this discussion.
Subsequently, Accardo set-up a face-to-face meeting with Agent Frank Roemer, who was the lead agent assigned to investigate Accardo's crew. This turned-out to become a small group meeting of several members of both groups. Due to Accardo's initiative, an agreement was reached which declared families "off-limits" for the turmoil & struggles occuring between the Outfit & the FBI. The agreement apparently was successfully honored for the several remaining decades Accardo remained in power.
So if Agent Roemer is to be believed, and over the years nothing of substance in his book has been successfully factually challenged of which I'm aware, it would seem the guy that ran the outfit in it's modern heyday had higher standards in respecting an opponent's family, than Mr. Cruz!
And that's quite a statement!
Referece:
Amazon - Accardo: The Genuine Godfather