  Galactic superwinds occur in almost all infrared-luminous galaxies with star
formation rates (SFRs) above 10 M_sun/yr, as shown by studies of the NaI D
interstellar absorption line. We demonstrate that this result also applies to
ultraluminous infrared galaxies (ULIRGs) which host an active galactic nucleus
(AGN) embedded in a strong starburst (SFR > 100 M_sun/yr) by studying a sample
of 26 Seyfert ULIRGs in NaI D. The infrared luminosity of these galaxies is
powered jointly by the AGN and starburst. We find that there are hints of the
influence of the AGN on outflows in Seyfert 2/starburst composites, but the
evidence is not yet statistically conclusive. The evidence we find is lower
wind detection rates (i.e., wind opening angles) in Seyfert 2 ULIRGs than in
galaxies of comparable L_IR, higher velocities than in galaxies of comparable
SFR, and correlations between the neutral gas and the ionized gas in the
extended narrow-line region. Though the AGN probably contributes to the
outflows in Seyfert 2 ULIRGs, its momentum and energy injection is equal to or
less than that of the starburst. Similarly, the outflow mechanical luminosity
(energy outflow rate) per unit radiative luminosity is the same for starburst
and Seyfert 2 ULIRGs. In the nuclei of Seyfert 1s, we observe small-scale
outflows that are powered solely by the AGN. However, in Mrk~231, we observe
both a high-velocity, small-scale and low-velocity, extended outflow. The
latter may be powered by a starburst or radio jet. These large-scale,
lower-velocity outflows certainly exist in other Seyfert 1 ULIRGs, but they are
washed out by the light of the nucleus.
