I see several possibilities of what was with GH's list...
1. He was telling the truth in a huge gamble of a double bluff
2. He was telling the truth but these people of rival Mafia groups.
3. He was flat out lying and these people are innocent
4. He was guessing and these peope may be innocent and there is no way of knowing if they are in fact guilty
5. One of these people are a fellow Mafia person, but he was taking the gamble that one of them would be killed/investigated and found to be innocent, and as such we would assume that they all were, allowing one to sneak under the radar.
Make up your own mind. Any comments more than welcome.
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