The Collingwood Manor Massacre Killing , is the name Name_conferral that was given Giving to a notorious hit put out on three Chicago gunmen by the notorious Purple Gang on September 16 , 1931 .

Bladensburg Dueling Grounds is a small spit of land , a fraction of its original size , along Dueling Creek , formerly in the town of Bladensburg , Maryland , and now within the town of Colmar Manor , just to the northeast of Washington , D.C. , United States .