Beginning in the 1830s, the U.S. Postmaster General refused to allow the mails to carry abolition pamphlets to the South. Northern teachers suspected of abolitionism were expelled from the South, and abolitionist literature was banned. One Northerner, Amos Dresser (1812–1904), in 1835 was tried in Nashville, Tennessee, for possessing anti-slavery publications, convicted, and as punishment was whipped publicly. Southerners rejected the denials of Republicans that they were abolitionists. They pointed to John Brown's attempt in 1859 to start a slave uprising as proof that multiple Northern conspiracies were afoot to ignite slave rebellions. Although some abolitionists did call for slave revolts, no evidence of any other Brown-like conspiracy has been discovered. The North felt threatened as well, for as Eric Foner concludes, "Northerners came to view slavery as the very antithesis of the good society, as well as a threat to their own fundamental values and interests". The famous, "fiery" abolitionist Abby Kelley Foster, from Massachusetts, was considered an "ultra" abolitionist who believed in full civil rights for all black people. She held to the view that the freed slaves would colonize Liberia. Parts of the anti-slavery movement became known as "Abby Kellyism". She recruited Susan B Anthony and Lucy Stone to the movement. Effingham Capron, a cotton and textile scion, who attended the Quaker meeting where Abby Kelley Foster and her family were members, became a prominent abolitionist at the local, state, and national levels. The local anti-slavery society at Uxbridge, Massachusetts, had more than 25% of the town's population as members.