  The results of spectropolarimetry surveys of obscured AGNs are reviewed,
paying special attention to their implications for the existence of two
populations of type 2 Seyfert galaxies -- hidden Seyfert 1s and "true" Seyfert
2s. In this context, the results from our Keck spectropolarimetry survey are
presented. Similar to previous work, we have detected hidden broad-line regions
(HBLRs) in about half of our sample. However, owing to different selection
methods, we find that differences in the properties of HBLR and non-HBLR
objects are much less pronounced than prior reports have indicated.
Spectropolarimetry studies continue to benefit AGN research, as illustrated by
the discovery of double-peaked H-alpha emission in the polarized-flux spectrum
of NGC 2110.
