https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13970376
A crowd gathered in Exeter Hall, London, to hear speakers on the abolition of the slave trade. Coloured engraving by J. Harris, 1840, after S. Blunt.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use