Abraham op den Graeff – First Protest Against Slavery Landmark Sign by Hartford|Published October 25, 2019-at dimensions 288 × 425 in Abraham op den Graeff – One of America’s First Slavery Protestors Images navigation Previous Abraham op den Graeff - This marker stands today in Germantown near the place where the first American Protest against slavery was created. This marker stands today in Germantown near the place where the First Protest Against Slavery document was signed