The Fugitive Slave Act or Fugitive Slave Law was a law passed by the 31st United States Congress on September 18, 1850, as part of the Compromise of 1850 between Southern interests in slavery and Northern Free-Soilers. From Wikipedia
The National Park Service has revised its Underground Railroad webpage, emphasizing 'Black/White cooperation' and removing references to slavery, as part of a broader campaign to reshape historical narratives.