Yes, it's Top Cat, the most respectable leader of the gang! Of course, if you've seen Top Cat and the Phil Silvers shows, you've undoubtedly noticed that both shows share a number of similarities. It was, after all, Hanna-Barbera's fashion to create a new character by loosely basing it (or not so loosely, in some cases). Even the voices would be similar to the voices of the actors who played the characters which inspired the H-B characters.
I say similar, becuase if you do really compare the H-B character voice with the original actor, you'll notice it's not a 100% imitation.
Mark Evanier has pointed this out numerous times, naturally.
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