Yet the president has not, in his two speeches, defined the "murderous ideology" in any detail.
Some spectators thought even at the time that her cinematic gift had served to legitimize a murderous ideology, but almost nobody belittled her artistic talent.
That era came to an end in 1914, to be replaced by murderous nationalistic and totalitarian ideologies.
He argues as well that "political Islam" - jihadism - constitutes "the most coherent and deadly mass--murderous ideology since Nazism."
The allies' compact with Stalin was a military alliance, not an endorsement of Stalin's murderous ideology.
They are the heirs of all the murderous ideologies of the 20th century.
We need to neutralise the murderous ideologies that create terrorists.
From now on the European Union must also concentrate on identifying, following the trail, and dismantling these murderous ideologies that form the basis of terrorism today.
Mr President, Soviet Communism was the most murderous ideology devised by our species.
Gerson wrote: "They're the heirs of all the murderous ideologies of the 20th century.