  We have embarked in an HST program to determine the masses of black holes in
spiral galaxies directly by measuring the line emission arising from an
extended accretion disk. For each of the galaxies in our sample we have
measured the rotation curve and determined the mass distribution within the
inner 5-50 pc. We have modeled the stellar mass component using the photometric
data from existing HST images and using both data sets we have derived the
masses of the black holes in each galaxy. These results will be very important
in clarifying the role of the black hole in powering the AGN, will shed light
into the effectiveness of the accretion mechanisms and finally will be
important in addressing the fundamental issue of unification for Seyfert 1 and
Seyfert 2 galaxies.
