Dominic (Butch) Blasi was an inducted member of the Chicago Outfit, a soldier, who happened to be one of the most trusted aides, chauffeur-bodyguard, and daily companion to Sam Giancana.

In fact, toward Giancana's last days, Blasi was said to be one of the few, very few, men who could get close enough to Sam (and was trusted enough by him), to whack him!

[which is exactly what Blasi is very, very strongly suspected of having done]...as per direct orders from Accardo and Ricca.