Scarfo had johhny keys clipped as a request to castellano. Scarfo was cleaning house and viewed keys as a potential threat. Keys was in fact a bruno loyalist and may have viewed scarfo as having some prior knowledge of Bruno’s killing. Remember, scarfo had a good west side connection and it was the west side that caponegro approached. I find it hard to believe scarfo had no knowledge especially since testa knew. I also imagine bobby manna knew about the plot and he was close to scarfo. Did bobby manna keep this secret from scarfo ?? I doubt it. Keys was killed when he was in his 70’s supposedly because he bad mouthed testa. I think that was an excuse. Purely conjecture on my part .