The Slave Ship - J. M. W. Turner (1840)

Slavers Throwing overboard the Dead and Dying—Typhoon coming on (1840)
Wikipedia - "The Slave Ship, originally titled Slavers Throwing overboard the Dead and Dying—Typhoon coming on, is a painting by the British artist J. M. W. Turner, first exhibited in 1840. Measuring 35 3/4 x 48 1/4 in. in oil on canvas, it is now in the Museum of Fine Arts, Boston. In this classic example of a Romantic maritime painting, Turner depicts a ship, visible in the background, sailing through a tumultuous sea of churning water and leaving scattered human forms floating in its wake. J.M.W. Turner was inspired to paint The Slave Ship in 1840 after reading The History and Abolition of the Slave Trade by Thomas Clarkson. In 1781, the captain of the slave ship Zong had ordered 133 slaves to be thrown overboard so that insurance payments could be collected. This event probably inspired Turner to create his landscape and to choose to coincide its exhibition with a meeting of the British Anti-Slavery Society. Although slavery had been outlawed in the British Empire since 1833, Turner and many other abolitionists believed that slavery should be outlawed around the world. Turner thus exhibited his painting during the anti-slavery conference, intending for Prince Albert, who was speaking at the event, to see it and be moved to increase British anti-slavery efforts. ..."
Wikipedia
W - Zong massacre
[PDF] "Turner's Slave Ship: The Victims of Empire"
John Ruskin on J.M.W. Turner’s The Slave Ship
Khan Academy: Turner, Slave Ship (Video)

French, A. M., Slavery in South Carolina and the ex-slaves; or, The Port Royal Mission. (1862) 

November 2007: J. M. W. Turner, 2009 April: Turner & Italy, 2011 June: J. M. W. Turner - 1, 2014 June: In Which We Find His Theory Of Color Implausible, 2014 September: The EY Exhibition: Late Turner – Painting Set Free, 2015 May: Mr. Turner (2014)