In 1787 London, a handful of Quakers meet in a printing shop to begin what becomes a decades-long campaign against Britain's slave trade. Adam Hochschild's narrative history follows Thomas Clarkson, William Wilberforce, and others as they invent boycotts, petitions, and fundraising drives to challenge an entrenched empire-wide institution.
A conscience-driven cause succeeds as a disciplined political machine, not just as a gathering of devout individuals. Its tools included a national campaign with local committees, petitions, boycotts, newsletters, posters and badges. These methods became the template that later reform and labor movements copied.
People ignore suffering that happens far away until someone draws a line from it to their own daily life. Campaigners made people see what lay behind the sugar in their tea and the tobacco in their pipes. That bridge between the familiar and the distant turned a remote abuse into a personal question for ordinary buyers.
Campaigners quickly learned that showing the public real suffering persuaded far more people than moral or scriptural arguments did. They filled pamphlets with eyewitness accounts. People bought the testimonies, not the abstract reasoning.
Oppressed people have always rebelled, but a mass movement can also form among people who have nothing personally at stake. It happened when large numbers of people grew outraged over someone else's rights and stayed outraged for years. That sustained empathy for distant strangers was something new, and it can be built deliberately.
An idea most people laugh at can become the central question of public debate within a few years, and can win within one lifetime. Reformers here faced both wealthy interests and assumptions almost everyone shared. Change still came through chance, friendships, patience and stubbornness, gradually at times and then suddenly, like weather.