Thomas Jefferson was the one who enslaved his own children. While many people don't know for sure what happened between him and Sally Hemings, it was definitely a controversial case that has been debated for many years.
George Washington tried to recapture an enslaved woman, who had already fled to New Hampshire. This women was named Ona Judge, and this happened in 1796.
Samuel Adams failed to defend property rights of indigenous people. Also fun fact, he was really terrible at managing money.
Here's the answers and a little bit about them.