I also agree that Rutherford (Ratherfraud) is the top villain on the list, the WTS as we know it is not Russell's creation but Ratherfraud's and bears the imprint of his demonic personality everywhere.
Russell though not a saint he was far more balanced, for him Armageddon was the destruction of human government not most of mankind and he didn't visualise a total isolation of the dubs from the rest of society or a centralised dictatorial organisation and the earth bound class that is not part of the New Covenent. It was Ratherfraud that propagated those situations, after hijacking Charlie's org.
Russell though had some strange connections with free masonry and the occult that create disturbing suspicions.
As for Franz he has to be the No 2 villain due to his extreme power lust and for introducing the blood ban and the shunning policy among the dubs also for making the org fully dictatorial. He dominated for decades even during Knorr's era.