Stalin should come ahead of Hitler, he killed more innocent people. You might also consider diseases. Ebola and AIDS are dangerous, hard for man to fight, arrive unseen, and hang around forever.
Ignorance likewise is dangerous, hard to fight,exists unseen, and hangs around forever.
Stalin should come ahead of Hitler, he killed more innocent people. Ebola and AIDS are dangerous, hard for man to fight, arrive unseen, and hang around forever.