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We point out the existence of a non-perturbative exact nilpotent BRSTsymmetry for the Gribov-Zwanziger action in the Landau gauge. We then putforward a manifestly BRST invariant resolution of the Gribov gauge fixingambiguity in the linear covariant gauge.

An exact nilpotent non-perturbative BRST symmetry for the Gribov-Zwanziger action in the linear covariant gauge