Machinists Union Racing was a CART Indy Car team owned by the International Association of Machinists and Aerospace Workers and run by the IAM's national automotive coordinator Andy Kenopensky, a former appointee to the United States Metric Board.
From 1981 to 1988 it was additionally sponsored by Schaefer Beer alongside the Machinists Union branding.
They had initially experimented with building their own chassis in 1980 but it was abandoned before it hit the track.
Throughout his involvement in the sport, team manager Andy Kenopensky was a constant critic of CART's management of the sport and complained that the racing was too expensive and that rules were being crafted to benefit large-budget teams at the expense of small-budget teams such as his own.
[1][2] The union and Schaefer also sponsored a NASCAR Winston Cup entry for Joe Ruttman in the 1989 Daytona 500 fielded by CalCar Motorsports.