My two cents worth!

No doubt it is well known, no secret Michael is a Mafia Don

GF III reporters were still asking even after he had achieved the semblance of legitimacy with being the largest single shareholder of Immobiliare
"What about Mr. Corleone’s connections with Las Vegas gambling? What about his involvements with the underworld?"

Michael's "legitimate" front was the Elephant in the room

I reckon people were not treating him as crime boss to his face and going along with his "legitimate" front

He sat with all those business people at Batista's meeting and Roth's birthday party like he was no different, was one of them
Senators were associating with him, Anthony's first Communion party at his home, Superman club and the Presidential palace New Year reception