The antislavery settlers, sometimes sponsored by Northern abolitionists, organized a government in Topeka. In 1816 the American Colonization Society was founded in a collaboration by abolitionists and slaveholders. Grant was supported by Frederick Douglass, prominent abolitionists, and Indian reformers. Southerners rejected the denials of Republicans that they were abolitionists. These anti-slavery sentiments were popular among both white abolitionists and African-American slaves. Many were abolitionists and Unionists during the American Civil War. Booth was strongly opposed to the abolitionists who sought to end slavery in the U.S. Several white northerners were suspected of being secret abolitionists. Most contentious was the Fugitive Slave Bill, whose provisions were anathema to abolitionists. It was founded by evangelical abolitionists in 1860. Support for the abolitionists was reflected in Romanian literature of the mid-19th century. Prominent among these Christian abolitionists were William Wilberforce and John Woolman. They were aided in England by a group of prominent abolitionists, including Harriet Martineau. The remaining party was also called the Radical Abolitionists. Southern Democratic newspapers slammed him as a friend of abolitionists and Republicans.