Dianajane asked:

Who is the philosopher who said, "The end does not justify the means"?

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I do not believe that any particular philosopher ever actually stated that. But, I think, that Immanuel
Kant (18th century German philosopher) is the philosopher very much associated with that position.
Kant held that the rightness or the wrongness of an action is never a function of its consequences, or
even its intended consequences. Rather, Kant held that the rightness or wrongness of an action
depends entirely on the agent's (the person who does the action) motive in doing the action. He also
held that this motive must be that of doing the right thing just because it is the right thing to do.

Ken Stern