in conjunction with
Michael & Hagen towards the end of 1

Let's say Frankie Pentangeli's brother Vincenzo didn't magically materialise! all the way from Sicily

If Frankie who has had no buffer between Michael and himself, had corroborated the Senate committee's nefarious charges [Corleone crime empire, murder, interests or control over gambling or narcotics and a lot more!] against Michael....

It is still Frankie's [and Willie Cicci] word against Michael's

We seem to agree, even if Frankie had corroborated, there is no real proof for the committee to recommend a count of perjury against Michael and “the US Attorney wouldn't have been able to indict Michael ”much less try him and convict him”

As far as we know there was no investigation by the Nevada Gaming Commission

Surely Roth-Questadt would have factored in all these?
So the purpose of Roth-Questadt was to try and damage Michael's standing, at least, dent his legitimacy “in the court of public opinion”

However reasonable conclusion - Michael continued as “legitimate" businessman and "public benefactor" without any major adverse effects - No wonder! the Pope blessed and knighted Michael