The best of poison is undoubtedly that extracted from corpses. But we find this hard to obtain unless we can get it through suitable persons. Prepare the arms shortly before they are to be used otherwise they may not be any good. Prussic acid is not very good as it dissolves quickly. Poisoned bullets shot from a noiseless gun, pipe or apparatus are very good.
Thick clothing prevents their effectiveness so aim for face or hands as a wound is necessary.
Try on animals as trying beats studing. All of the workers should arm themselves secretly with the best modern rifles and firearms. Do not stand defenseless and hopeless against a bunch of uniformed assassins and cutthroats. Do not depend on the other fellow. Be prepared and the other will also.