  We report on a calculation of one-loop weak corrections to polarized
quark-gluon scattering and the corresponding crossed channels. Such
contributions are suppressed formally by one power of alpha_s relative to W- or
Z-mediated quark-quark scattering, but would enable the spin asymmetry of the
gluon distribution to contribute to parity-violating asymmetries that will soon
be investigated in polarized proton-proton scattering experiments at RHIC. In
certain kinematic regions, gluon contributions to parity-violating asymmetries
can be as large as 10% of the tree-level W- and Z-exchanges in quark-quark
scattering, but usually only where the parity-violating asymmetries are already
small.
