Original: His publishing firm also released three anti-Semitic books for children , including the 1938 Der Giftpilz ( '' The Toadstool '' or '' The Poison-Mushroom '' ) , one of the most widespread pieces of propaganda , which purported to warn about insidious dangers Jews posed by using the metaphor of an attractive yet deadly mushroom .
Simplified: His publishing firm released three anti-Semitic books for children , including the 1938 Der Giftpilz ( The Poison Mushroom ) , one of the most widespread pieces of propaganda .