Roth really knows precious nothing that would be detrimental to Michael personally
He had nothing concrete even if he wanted to sing
No doubt the humiliated FBI would jump at another chance but not on, not worth a nickel! 'ramblings' of Roth who would be desperately trying to save his own skin
You need to understand US criminal and regulatory laws:
At
minimum Roth knew about Michael's hidden, undeclared ownership and control of three Nevada casinos, and his attempt to gain control of another by moving out Klingman--Roth (through Johnny Ola), invited Michael to move out Klingman. Recall Michael's testimony at the Senate hearing:
QUESTADT
Is it true that you have a controlling interest in three of the major hotels in Las Vegas.
MICHAEL
No it is not true -- I own stock in some of the hotels there -- but very little.
Michael perjured himself with that testimony. Roth, as a government witness against Michael, could have resurrected the perjury rap against Michael--a potential five year prison sentence for each instance of perjury.
What was more, having hidden interests in casinos is a major felony under Federal law and a violation of Nevada gaming regulations. Even if the government could not convict Michael because only one witness (Roth) testified against him, the Nevada Gaming Commission would have yanked his licenses because of his undeclared ownerships--Gaming Commission rules don't require a corroborating witness in order to put someone in their "Black Book". Michael's "legitimate" standing would have suffered a fatal blow even if he never went to prison. That would have greatly pleased Roth--and the FBI.
Also keep in mind that Roth knew Michael ordered the murder of Moe Green. Willy Cici, who flipped when Pentangeli flipped and was still alive and in government custody, pulled the trigger. The government might have been able to put Roth and Cici together to build a murder case against Michael. Even trying to do so would have further damaged Michael.
