Mafiosi in Alcatraz

Just being curious: were there any mafia leaders to have served time in Alcatraz apart from Al Capone and Charlie Carrollo?
And by the way, how did those 2 end up there anyway? I mean, they were murderers, but "formally" they were just tax evaders, being convicted only for this, so how did they end up in a prison for people convicted for dangerous crimes?
Not saying they didn't deserve it, just wondering what the "formal" reason for transferring them there was.

Wasn't Whitey Bulger locked up there?

Yes.

I guess that whitey was in alc it impressed alot of mob guys and winter hill.

Off subject but the whole subject is whitey a rat. He deff had john on the payroll but why he didn't tell any mob guys mercurio was a rat idk. Maybe whitey didn't no. That's a thread on its on. What a cluster fuck. Jr Russo saved whitey life and I guess there was mutual respect. I think whitey said Jr Russo was in Boston when barboza was killed in San Fran giving him a alibi.

Mickey Cohen was there too.