 Sigma Nu ( " Sig Nu " ) at Dartmouth College was originally formed in 1903 as the Pukwana Club , an organization that was created as a reaction to the perceived elitism of Greek organizations at the time . The club ’ s concept was based on the love for the traditions of Dartmouth , faithful friendship , and honorable dealings . In 1907 , the Pukwana Club joined the national fraternity system after it received a charter to become the Delta Beta chapter of Sigma Nu . Sigma Nu ’ s " Way of Honor " principle was very similar to the principles expressed in the Pukwana Club ’ s original charter . The first residence for Sigma Nu at Dartmouth was purchased and refurbished in 1911 . Known as the Green Castle , it served as chapter headquarters until the current house was built in 1925 . In response to the national fraternity ’ s segregationist membership policies , the fraternity went local in 1963 , becoming Sigma Nu Delta . In 1984 , after the national fraternity 's policies were changed , the fraternity reaffiliated with the national . In the summer of 2007 , the Sigma Nu residence underwent significant structural renovations to bring the building up to the college 's minimum standards and improve living facilities . Improvements included an enclosed fire escape running from the first floor to the third floor , a redone kitchen and bathroom , new flooring , a new study room , and alterations to bedrooms . Prominent alumni include acting Solicitor General of the United States Neal Katyal ' 91 . 
