  In this Letter, we propose a model which is equivalent to the Yang-Mills
theory at long distances but for which all symmetries are realized linearly. On
top of the gauge and Fadeev-Popov ghosts fields, the model presents several
massive fields, all of which can be merged in a unique vector field with
support in a curved superspace. The equivalence of this model with the
gauge-fixed Yang-Mills theory is shown to result from the decoupling of these
extra massive modes at small momenta. Most of the symmetries of Yang-Mills
theory, including the famous BRST symmetry, can be interpreted in this way as
isometries of the superspace.
