In 1850 he made the first, and, it may be said, the only noticeable effort in behalf of the anti-slavery cause, that is recorded of him prior to 1854. The Fugitive Slave Law, enacted by the Thirty-first Congress, provided for the use of all the forces of the Department of Justice, to effect the arrest of fugitives from slavery, and the restoration of them to their masters. Brown conceived the idea of uniting the free negroes and fugitive slaves in an organization to resist the enforcement of the provisions of this law. The society was to be called "The United States League of Gileadites." The plan failed; the enrollment so far as known was confined to the Springfield, Massachusetts, branch, which numbered fifty-three members.[53] But the activities therein undertaken were strictly defensive in their character; they were not directed against slavery, but for the personal protection of fugitive slaves and free negroes living in the Northern States. His letter of advice to the Gileadites is, in part, as follows:[54]

WORDS OF ADVICE

"Union is Strength"

Nothing so charms the American people as personal bravery. Witness the case of Cinques, of everlasting memory, on board the "Amistad." The trial for life of one bold and to some extent successful man, for defending his rights in good earnest, would arouse more sympathy throughout the nation than the accumulated wrongs and sufferings of more than three millions of our submissive colored population. We need not mention the Greeks struggling against the oppressive Turks, the Poles against Russia, nor the Hungarians against Austria and Russia combined, to prove this. No jury can be found in the Northern States that would convict a man for defending his rights to the last extremity. This is well understood by Southern Congressmen, who insisted that the right of trial by jury should not be granted to the fugitive. Colored people have ten times the number of fast friends among the whites than they suppose, and would have ten times the number they now have were they but half as much in earnest to secure their dearest rights as they are to ape the follies and extravagances of their luxury. Just think of the money expended by individuals in your behalf in the past twenty years! Think of the number who have been mobbed and imprisoned on your account! Have any of you seen the Branded Hand? Do you remember the names of Lovejoy and Torrey?

Should one of your number be arrested, you must collect together as quickly as possible, so as to outnumber your adversaries who are taking an active part against you. Let no able-bodied man appear on the ground unequipped, or with his weapons exposed to view; let that be understood beforehand. Your plans must be known only to yourself, and with the understanding that all traitors must die, wherever caught and proven to be guilty. "Whosoever is fearful or afraid, let him return and depart early from Mount Gilead" (Judges, vii. 3; Deut. xx. 8). Give all cowards an opportunity to show it on condition of holding their peace. Do not delay one moment after you are ready; you will lose all your resolution if you do. Let the first blow be the signal for all to engage; and when engaged do not do your work by halves, but make clean work with your enemies, and be sure you meddle not with any others. By going about your business quietly, you will get the job disposed of before the number that an uproar would bring together can collect; and you will have the advantage of those who come out against you, for they will be wholly unprepared with either equipments or matured plans; all with them will be confusion and terror. Your enemies will be slow to attack you after you have done up the work nicely; and if they should, they will have to encounter your white friends as well as you; for you may safely calculate on a division of the whites, and may by that means get to an honorable parley.

Be firm, determined, and cool; but let it be understood that you are not to be driven to desperation without making it an awful dear job to others as well as to you....

A lasso might possibly be applied to a slave-catcher for once with good effect. Hold on to your weapons, and never be persuaded to leave them, part with them, or have them far away from you. Stand by one another and by your friends, while a drop of blood remains; and be hanged, if you must, but tell no tales out of school. Make no confession.

In a letter to his wife, January 17, 1851, relating to the same subject, he said:[55]

Dear Wife ... Since the sending off to slavery of Long from New York, I have improved my leisure hours quite busily with colored people here, in advising them how to act, and in giving them all the encouragement in my power. They very much need encouragement and advice; and some of them are so alarmed that they tell me they cannot sleep on account of either themselves or their wives and children. I can only say I think I have been enabled to do something to revive their broken spirits. I want all my family to imagine themselves in the same dreadful condition. My only spare time being taken up (often until late hours at night) in the way I speak of, have prevented me from the gloomy homesick feelings which had before so much oppressed me: not that I forget my family at all.

The assumption that Brown, "The peaceful tanner and shepherd," had at this time been transformed "into a man burning to use arms upon an institution which refused to yield to peaceful agitation,"[56] is not justified by anything that he had theretofore said or done relating to slavery; neither is it justified by what he wrote to the "Gileadites," nor by the letter which he wrote to his wife concerning the condition of the free negroes. These papers contain no hint, to say nothing of evidence, that the action taken therein by him was the result of any preconceived intention to attack slavery; or that it was related to any general plan or purpose to oppose slavery; or that it foreshadowed any disposition on his part, burning or otherwise, to engage in the matter any further than by counsel and advice. The letter to his wife reflects the general sense of compassion that was felt for the negroes, by all humane people throughout the North, because of the distressful condition in which they were placed by the terms of the Fugitive Slave Law.