Who else tried to help the slaves in Colonial America?

In 1833, the American Anti-Slavery Society was established in Philadelphia to advance the abolition of slavery in the United States.

The first such society in America, it was made up of smaller local groups. The American Anti-Slavery Society was formed by Theodore Dwight Weld (1803-1895), Arthur Tappan (1786-1865), and Lewis Tappan (1788-1873), who were militant in the fight against slavery.

The society operated until 1870, when the adoption of the Fifteenth Amendment to the U.S. Constitution granted citizenship to blacks.