William Wilberforce - answersingenesis.org
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John Newton, the author of Amazing Grace, was involved in the slave trade before he became a Christian. After his conversion, John Newton became a pastor. Here is a message about one of the members of John Newton's congregation - William Wilberforce - who would lead the way to banning the slave trade in England:
William Wilberforce and the War Against Slavery, by Dr. Peter Hammond
Recommended sermon by John Newton (1725-1807): MANY ARE CALLED, FEW ARE CHOSEN: THE TERRIFYING MATHEMATICS OF ETERNAL LIFE
Here is a poem by John Newton (1725-1807): I Asked the Lord That I Might Grow (Video)
A lesser know hymn written by John Newton is Day of Judgment, Day of Wonders.