Besides the feuds he had with officers in the Army, Lilburne soon engaged in a quarrel with William Prynne. On 7 January 1645 he addressed a letter to Prynne, attacking the intolerance of the Presbyterians, and claiming freedom of conscience and freedom of speech for the independents, Prynne, bitterly incensed, procured a vote of the Commons summoning Lilburne before the committee for examinations (17 January 1645). When he appeared (17 May 1645) the committee discharged him with a caution. A second time (18 June 1645) Prynne caused Lilburne to be brought before the same committee, on a charge of publishing unlicensed pamphlets, but he was again dismissed unpunished. Prynne vented his malice in a couple of pamphlets: "A Fresh Discovery of prodigious Wandering: Stars and Firebrands", and "The Liar Confounded", to which Lilburne replied in "Innocency and Truth Justified" (1645). John Bastwick took a minor part in the same controversy. John Lilburne then began in earnest his campaign of agitation for freeborn rights, the rights that all Englishmen are born with, which are different from privileges bestowed by a monarch or a government. He also advocated extended suffrage, equality before the law, and religious tolerance. His enemies branded him as a Leveller but Lilburne responded that he was a "Leveller so-called." To him it was a pejorative label which he did not like. He called his supporters "Agitators." It was feared that "Levellers" wanted to level property rights, but Lilburne wanted to level human basic rights which he called ""freeborn rights"". At the same time that John Lilburne began his campaign, another group led by Gerrard Winstanley styling themselves "True Levellers" (that became known as Diggers), advocated equality in property as well as political rights. Lilburne was imprisoned from July to October 1645 for denouncing Members of Parliament who lived in comfort while the common soldiers fought and died for the Parliamentary cause. It was while he was incarcerated that he wrote his tract, "England's Birthright Justified". In July 1646, he was imprisoned in the Tower of London for denouncing his former commander the Earl of Manchester as a traitor and Royalist sympathiser. It was the campaign to free him from prison which spawned the political party called the Levellers.