Before Hitler rose to power in 1933, there were small groups of German-Americans residing in the U.S. They gathered in small bunds or clubs for the purpose of comraderie and affiliation. These groups gathered all over the U.S. in as many as 120-150 known locations. It wasn't until the rise of the National Socialist party in Germany that these clubs became more vicious than docile and clung to a firm doctrine of Nazism. Though little is known about this particular Bunds involvement in violence or public misconduct, other Bunds in the area were, at times, very threatening.
The German American bunds began to follow Nazi ideology and held resentment towards Jews and Capitalism in favor of Hitler's rule. As the Bunds grew in size and hatred, the FBI made a move in 1941 to clear them out. Federal Hill, also known as Camp Bergwald, was one of the last Bunds to be disbanded.
Federal Hill itself holds more history than just Nazi Bunds. I have heard rumors of Colonial troops from the Revolutionary war setting up camp here for a few months to await battle orders. Though I found no evidence of Revolutionary era artifacts, it may well have been a landmark to station troops.
The first of the few structures that we found are depicted above. These structures were built right into the rocks of the hill. Inside this structure, one of the walls is nothing simply natural gneiss rock with the house built around it.
To the right and below are the steps and wall of what I think was either a pool or reservoir. 
The photo above is the wall to the pool/reservoir with the steps in the background previously depicted.
This link provides details to a mountainside bunker. We weren't able to locate it and I think it may have been destroyed by one of the quarries. http://www.weirdnj.com/index.php?option=com_content&task=view&id=94&Itemid=28
There are two quarries on either side of Federal Hill and both of them appear to be taking large swaths of rock from the mountain side. It wouldn't be surprising if soon, Federal Hill itself was destroyed completely.
This stone writing was difficult to read and all three of us came to different conclusions as to what it said. Quite possibly it was the name of the leader of the Camp Bergwald, or even a Revolutionary era carving into the Mountain.
(Photography by: Ryan Perst)
