It was a big coverup, guzik was so loyal to capone he would have done anything capone asked of him, theres theres nemerous accounts that people have said when they went to his house they was suprised at how healthy he looked, when he left alcatraz his family tooked him to baltimore to get mercury cleaned out of his system and he continued to get better until his death, theres a whole bunch of lies about capone in the media and in movies
"McGurn likes you, so I make you. So you are now one of us, if you fuck up, we take it out on McGurn. He is your sponsor. Fuck up, it's his ass. You work in his crew, he is your capo."
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