Took a group of 19. Just myself and two others climbed the true summit rock. We descended to Frog Lake and were met with a very angry man who told us to get off his property and follow the road out of there. He called his neighbor who waited for us on private land. While we were walking towards the Forest Service boundary we noticed him and knew he was armed. We descended to Euler Valley. Another neighbor escorted us out of the land, but then the neighbor who was waiting for us came out of nowhere on his ATV screaming at us and holding a gun. We left the private land and discussed this on the way back to the car. We learned our lesson to approach from the east or via the PCT.