AGC's mission is to be an association of constructors and related businesses committed to promoting the balanced interests of its members and advocating the highest standards of quality, professionalism and ethics. About AGC: Chartered in 1951 Associated General Contractors of Maine ( AGC Maine) proudly enters its second half-century as a state chapter of Associated General Contractors of America (AGC). AGC Maine is dedicated to ensuring a sound and healthy construction industry, and providing the public with an assurance of the skill, responsibility and integrity of AGC-member firms.