He opposed the terror tactics of the russian revolutionaries of the time, yes(like Bakhunin, for example). But not because it was willful killing, but because it was counterproductive. The masses needed to be rallied, then one could use violence.
Lenin was a die-hard totalitarian who had zero qualms about killing anyone and everyone who disagreed, but he too opposed the terror tactics. Stalin isn't my strongest point, but I believe he only believed in terror as a way to gain funds for the party(through postal robberies). But don't quote me on that.
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