Frequently a crime is committed by a man under the influence of another. A person with an evil thought of revenge, or the desire to kill somebody, by the very concentration of his evil thought becomes so weak that he cannot do it himself. Then he may consciously or unconsciously, by the intensity of his desire, convey to some other person the suggestion of doing it. The other person is innocent of the evil desire and so has the strength to accomplish it. This is often seen with anarchists; among anarchists there are some who only plan the deed, and there are others who carry it out.