Oliver Wendell Holmes did not own slaves

J.L. Bell compares the Boston Massacre trial on the John Adams mini-series with the historical record, concluding with the possibility that the screenwriters got confused between Oliver Wendell, who had a slave who testified, and Oliver Wendell Holmes, the monicker of two rather more famous Bostonians (one of whom I can thank for the name of this site), neither of whom were even alive during the Revolution.