Back in the summer of 1976, I was living in East Hartford, CT and one Sunday afternoon decided to take a walk along the top of the dike on the western bank of the Connecticut River.
http://www.topozone.com/map.asp?z=18&n=4627831&e=694430&size=s&datum=nad83&layer=DRG25
After parking at Riverside Park, I walked north and saw a guy standing at the top of the corner of the dike. He was a fairly large guy, built like a football player and was just standing on top looking around. I got to the top and said "Hi" and continued on. About 1/4 mile north, there was another guy I could see just standing there looking around also.
As I continued along the dike, I noticed a white Cadillac parked near the pumping station at the end of the dead-end road. I continued north for a while and the Cadillac drove to the intersection near I-91, then turned around and headed back to the pumping station. The two guys on the dike were still just looking around.
After a while, I turned south and noticed an older gentleman, flanked by two other "bodyguards" walking up the dike from out of the area between the dike and river. This area was criss-crossed by trails and was mostly overgrown brush and kind of swampy. The older guy was tall, with white hair and wore a white suit and white shoes. I guess he owned the Cadillac.
The group got to the top and started walking north as I was heading south. I said "Hi" to them and continued on. When I got back down the dike to the parking lot, I was curious and decided to see if any trails followed the river. I found one and headed upriver a little until I realized someone was following me. I stopped and looked at the river for a while and he just stood in the trail watching me. At that point, I decided to go back to the car and drove away and haven't been back since.