How do we know Clemenza was NY boss of the Corleone's? I thought NY was the Corleone homebase, under the direct control of the Corleone's. Tessio's territory was Brooklyn, I think (it's been a long time since I've seen GF), and that's a part of NY.

However, forgive me my disknowledge about Pentangeli, but he seemed rather 'weak' in the movies.

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See, we can act as smart as we want, but at the end of the day, we still follow a guy who fucks himself with kebab skewers.