the last years of the Republic ceased to be able to control them.[358] Again, in defending Sestius, Cicero asserts that Clodius in his tribunate had organised a levy of slaves under the name of collegia, for purposes of violence, slaughter, and rapine; and even if this is an exaggeration, it shows that such proceedings were not deemed impossible.[359] And apart from the actual use of slaves for revolutionary objects, or as private body-guards, it is clear from Cicero's correspondence that as an important part of a great man's retinue they might indirectly have influence in elections and on other political occasions. Quintus Cicero, in his little treatise on electioneering,[360] urges his brother to make himself agreeable to his tribesmen, neighbours, clients, freedmen, and even slaves, "for nearly all the talk which affects one's public reputation emanates from domestic sources." And Marcus himself, in the last letter he wrote before he fled into exile in 58, declares that all his friends are promising him not only their own aid, but that of their clients, freedmen, and slaves,--promises which doubtless might have been kept had he stayed to take advantage of them.[361] The mention of the freedmen in this letter may serve to remind us of the political results of manumission, the second fact in the legal aspect of Roman slavery. The most important of these is the rapid importation of foreign blood into the Roman citizen body, which long before the time of Cicero largely consisted of enfranchised slaves or their descendants; it was to this that Scipio Aemilianus alluded in his famous words to the contio he was addressing after his return from Numantia, "Silence, ye to whom Italy is but a stepmother" (Val. Max. 6. 2. 3). Had manumission been held in check or in some way superintended by the State, there would have been more good than harm in it. Many men of note, who had an influence on Roman culture, were libertini, such as Livius Andronicus and Caecilius the poets; Terence, Publilius Syrus, whose acquaintance we made in the last chapter; Tiro and Alexis, and rather later Verrius Flaccus, one of the most learned men who ever wrote in Latin. But the great increase in the number of slaves, and the absence of any real difficulty in effecting their manumission, led to the enfranchisement of crowds of rascals as compared with the few valuable men. The most striking example is the enfranchisement of 10,000 by Sulla, who according to custom took his name Cornelius, and, though destined to be a kind of military guarantee for the permanence of the Sullan institutions, only became a source of serious peril to the State at the time of Catiline's conspiracy. Caesar, who was probably more alive to this kind of social danger than his contemporaries, sent out a great number of libertini,--the majority, says Strabo, of his colonists,--to his new foundation at Corinth[362]. But Dionysius of Halicarnassus, writing