"Patty" Cannon, whose birth name may have been Lucretia Patricia Hanly (c. 1760 or 1759 or 1769 – May 11, 1829), was an illegal slave trader and the co-leader of the Cannon–Johnson Gang of Maryland–Delaware. The group operated for about a decade in the early 19th century kidnapping free Black people and fugitive slaves, along the Delmarva Peninsula to sell into slavery in the South. The activity became known as the Reverse Underground Railroad.