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In his autobiography Mein Kampf, Adolf Hitler described how, in his youth, he wanted to become a professional artist, but his aspirations were ruined because he failed the entrance exam of the Academy of Fine Arts Vienna. Hitler was rejected twice by the institute, once in 1907 and again in 1908.
Troublesome friends are often friends who can cause troubles for different reasons. Friends who get drunk and start breaking the law are one example of this that is quite common. Another is friends who break the law in general, pushing you in a moral and ethical dilemma on whether you should tell on them to the law enforcment.
Adolf Hitler lead the Holocaust so the answer would be the same for both questions. The answer to those is between five and six million Jews died during the Holocaust. It is impossible to know how many Jews died exactly though.