Mac A. Fleming (born September 22, 1945) is a former American labor union leader.
Born in Walnut Grove, Missouri, Fleming began working for the Atchison, Topeka and Santa Fe Railway (AT&SF) in 1968, and joined the Brotherhood of Maintenance of Way Employees.
He was soon elected as chair of his local union, and then became a system federation officer, serving for six years as general chair of the AT&SF system federation.
[1][2] As leader of the union, Fleming campaigned for improved safety and security, protection of workers' rights, and better funding of Amtrak.
[2] He undertook the largest example of negotiated rulemaking at the time, producing a proposal to improve safety for rail maintenance workers.