The Holocaust

People were brainwashed into disliking the Jews from the use of propaganda. This propaganda used animals such as monkeys to describe the Jews and to make them appear inferior to everybody else. Propaganda used images such as people with large noses to describe the Jews to make them appear ugly, which is why people were made to dislike them.
The Nazi's stripped the women Jews of their hair as a way of dehumanisation, to make them feel not human and different to everybody else, it was also a way of stripping them of the only thing they probably had left.