Hawk Mountain was well-known for the concentration of migrating raptors. Shooters (I DON'T call them hunters). Would shoot raptors by the thousands. It was considered 'good' conservation practice back then. It was distressing to see in the book: "Hawks Aloft: The Story of Hawk Mountain" the dead and dying raptors lined up like sardines. I'm so glad that that this misguided and sad era is now over in the United States. But, such practices are still around in regions of Europe, which is so distressing to hear about. Austria, Sweden, Malta are among several countries where legal hawk killing and persecution still occur. Falconers are striving to stop the practice.
http://hawkmountain.org/index.php?pr=Chronology