What about the anti-religious violence of
Spain's Red Terror, perhaps motivated by such Stalinist front groups as
The League of Militant Atheists proclaiming ...
There can be no doubt that the fact that the new state of the USSR led by the communist party, with a program permeated by the spirit of militant atheism, gives the reason why this state is successfully surmounting the great difficulties that stand in its way - that neither "heavenly powers" nor the exhortations of all the priests in all the world can prevent its attaining its aims it has set itself.
and ...
It is our duty to destroy every religious world-concept... If the destruction of ten million human beings, as happened in the last war, should be necessary for the triumph of one definite class, then that must be done and it will be done.
How is a program of terror "permeated by the spirit of militant atheism" not "atheistic terrorism"?