'Bambi' is a difficult movie to watch. From Bambi's mother being killed by a hunter to the forest fire at the end, it's a lot for a little kid (or even an adult) to take. So it's unsurprising that the book it is based on was somewhat controversial.
The book's author Felix Salten moved to Vienna as a baby in 1869. This was just after the government allowed Jewish people citizenship. Salten published 'Bambi' in 1923. The book received international acclaim. However, in 1936, it was banned by the Nazis because they believed it was "a political allegory of the treatment of Jews in Europe." The book was burned across Nazi states.
Salten, however, moved to Switzerland and wrote the sequal 'Bambi's Children.' He was introduced to Walt Disney years later and the 'Bambi' the movie came out in 1942.