Two green energy companies contributed a quarter of a million dollars to the American Indian tribe spearheading a months-long demonstration against an oil pipeline in North Dakota. Standing Rock Sioux voted unanimously April 5 to accept two $150,000 donations from ConEdison Development and Fagen Inc., both of which have partnered up to build windmills in the North Dakota area, according to internal documents kept by the tribe. ConEdison Development acquired land near Standing Rock’s reservation and began construction on a wind power facility last year. Fagen was a contractor on the project. The $250,000 donations to the tribe were meant...