  In the context of massless higher spin gauge fields in constant curvature
spaces, we compute the surface charges which generalize the electric charge for
spin one, the color charges in Yang-Mills theories and the energy-momentum and
angular momentum for asymptotically flat gravitational fields. We show that
there is a one-to-one map from surface charges onto divergence free Killing
tensors. These Killing tensors are computed by relating them to a cohomology
group of the first quantized BRST model underlying the Fronsdal action.
