[pp.int.general] Subscribing the German E-Petition against Internet-Censorship

[Richard Stallman]

    This is an old trick, and even Hitler knew about it. In his book "Mein
    Kampf" he wrote that if you say it is for the protection of the
    children, you can get away with anything.

Can someone find the chapter and approximately where this is?
It would be useful to document this (so many such quotations are
erroneous).