This is a great question. Because the media protected people back in the day, I wouldn't put Hornung's gambling suspension in 1963 up there. I'd say the Mark Chmura case. Johnny Jolly and others have had the drug or drinking thing, but Chmura was in a hot tub with high school chics, and although he was acquitted ... something shady did happen that night. Otherwise, nothing would have come of it. So, # 1, I'd vote for the Chmura case.
After that, I'd say Mossy Cade and James Lofton were definitely big-time incidents. Cade went to prison. Lofton got shipped out, having been one of the greatest receivers in team history. Eddie Lee Ivery had a huge coke problem, but he never got caught, he just got addicted.
Criminal acts committed by players like Mossey Cade, James Lofton and Mark Chmura were extensively reported by Green Bay and national media. Cade and Lofton were tried before a jury in Brown County Court. Both trials had juriors chosen from outside of Green Bay / Brown County. Cade was found guilty and
Lofton was found innocent by those juries . Chmura was put on trial and found innocent in the Milwaukee area , where he lived .
Hornung gambling was heavily reported by Green Bay and national media
media. In fact, Hornung was suspended for one year by NFL Commissioner Pete Rozelle.
However it was rumored in the 1960's, Players who commmitted misdemeanors in Green Bay/ Brown County (example fighting in public or drinking too much and causing disturbance in public) were reported to the Packers by local police but not to the media. Then Vince Lombardi would deal with players . I t was said they feared Vince more than the local police.
It was said Vince once fined Paul Hornung $500 for missing a Curfew. Back in 1950's and 1960's $500 considered a lot of money.
In th0se early days , Green Bay was much smaller city than today and everyone knew when a Packer player broke the law in public. Many times media knew nothing about the Packer situation , Yet "by word of mouth" everybody in Green Bay knew what the Packer player did in public (Bar or night club etc.)
In the modern era, everything done by Packer playes is reported by media