My guess is Tom probably knew, but he also probably did not approve of killing Fredol. Ayt that stage of the game Tom knew when to keep his mouth shut. The closest he comes is when he asks Michael "Do you want to take EVERYONE out?" To which Mike replies "No, Just my enemies."
"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"
"I stood in the courtroom like a fool."
"I am Constanza: Lord of the idiots."
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