From the Missouri Republican of Dec. 5. An Abolition Movement. The Niles (Mich.) Republican and the Laporte (In.) Tocsin contain accounts of the procecdings in that vicinity to rescue a fugitive slave from the custody of Mr. Samuel S. Gunn, of this city. The editors of those papers - especially the editor of the Niles Republican - seem anxious not only to screen the Abolition negro stealers from indignation, but to create as much excitement as possible against Mr. Gunn, for his course in the matter. The facts in this case are briefly as follows: From the representations made here last September by a negro who pretended to reside near Jackson, Michigan, it was supposed that several slaves belonging to citizens of this county were near Jackson and anxious to return to their masters. Mr. Gunn, who was about to visit Niles on business, was induced to get to Jackson and make arrangements for bringing them back. Although he did not find the slaves at Jackson, as represented, yet when at St. Josephs, on his way home, he saw on the steamer Algona, Sam Bolles, a slave belonging to Mr. Samuel Black of this city. The negro endeavored to conceal himself, and at first denied having been in St. Louis. - Finally, he conversed freely on the subject, and acknowledged that he was the slave of Mr. Black. Mr. Gunn had him arrested at Berrien, on the arrival of the steamer there, and started with him for St. Louis, via, Laporte, Indiana. The Abolitionists of Berrien and Niles employed men to start in pursuit of Mr. G. on the road near Laporte,and ordered him to stop. The parties finally proceeded together to Laporte; Mr. Gunn, for the purpose of having the matter judicially investigated, and the Abolitionists to procure the assistance of their confederates. Through the agency of Judge Henry, Justice Bailey, and others, Mr. Gunn was arrested illegally, harassed with several writs, and the slave finally liberated by the Abolitionists. The editor of the Niles Republican and a lawyer at Niles named Bacon, with their confederates, as we learn, instigated the proceedings against Mr. Gunn, and charged him with kidnapping Bolles. Judge Henry, residing near Laporte, also took a prominent part in this negro-stealing business. This Judge H. is celebrated in that region for his connexion with the case of the State versus Egbert, arrested for murder. From the details of this case, as we have learned them, it is evident that there is a number of Abolitionists in that part of Michigan and Indiana, ready to lend all the assistance in their power to trample upon the guaranties of the Federal Constitution. Whether the parties concerned in the rescue of Bolles and the arrest of Mr. Gunn, can be reached by process of law, we know not; but the public good requires that they should be exposed. It will be for the Criminal Courts in their respective neighborhoods to decide what punishment, if any, they shall receive. The most prominent Abolitionists in this outrage were Mr. Bacon, a lawyer at Niles, in Michigan, the editor of the Niles Republican, Orr and Reese, the Abolition scouts, - Ferson of Michigan; and Judge Henry, Mr. Jernegan, Mr. Orton, and others at Laporte. Several of the citizens of Laporte and Berrien, however, acted as become men anxious to uphold the Constitution and laws against the movements of a band of fanatics. The editor of the Niles Republican indulges in many harsh epithets against Mr. Gunn, but if that Abolition incendiary meets with his deserts, he will find snug quarters at the public expense, instead of denouncing, through his journal, worthy citizens of Missouri, for prosecuting their rights. The editor of the Laporte Tocsin admits that Bolles confessed to several citizens of that place that he was a runaway slave and belong to Mr. Black, of St. Louis. There is, then, no excuse for the outrages perpetrated at Laporte, and the utter disregard of the Constitution and laws. If the guaranties contained in the Federal Constitution, and the laws of Congress, can be trampled on with impunity by the Abolitionists of other States, the slaveholding States will be left without adequate protection for their property, and their citizens be exposed to similar annoyances to those to which Mr. Gunn was subjected whilst discharging his duty. Some remedy for these evils should be devised promptly, or the consequence may be disasirous to communication between the States. The following offences are made capital by the laws of the United States: Treason. Murder. Arson; burning dwelling-houses or other buildings. Rape on the seas. Robbing mail, second time, Forgery; as passing counterfeit certificates or other public security. Piracy; one species of slave-trade. Confining free blacks, or ofiering them for sale on shipboard. Robbery on the high seas. Setting fire to a ship of war. Burning ships of private property for the purpose of defrauding under-writers.