That was by George Orwell, and he has an even a better quote than that:
"The pacifist is objectively pro-fascist."
"The pacifist is objectively pro-fascist."
To continue your quote:
"This is elementary common sense. If you hamper the war effort of one side you automatically help that of the other. Nor is there any real way of remaining outside such a war as the present one. In practice, ‘he that is not with me is against me’."
People who aid and tacitly support the enemy's violence are not pacifists no matter what they call themselves.