This study presents new information about the four Quaker businessmen who helped found the London Abolition Committee in 1787 and remained active in the late anti-slave trade movement throughout their lifetimes. Drawing on previously unused primary sources, the study traces the close personal, business, social and religious ties binding the men together and shaping their abolition activities and arguments. By closely examining the lives of Joseph Woods, James Philips, George Harrison and Samuel Hoare, the study presents a new view of the factors shaping the arguments and strategies of abolitionism in Britain.