  We have made high-quality measurements of the polarization spectra of 13 FR
II radio galaxies and taken polarization images for 11 of these with the Keck
telescopes. Seven of the eight narrow-line radio galaxies (NLRG) are polarized,
and six of the seven show prominent broad Balmer lines in polarized light. The
broad lines are also weakly visible in total flux. Some of the NLRG show
bipolar regions with roughly circumferential polarization vectors, revealing a
large reflection nebula illuminated by a central source. Our observations
powerfully support the hidden quasar hypothesis for some NLRG. Classification
as NLRG, broad-line radio galaxy (BLRG), or quasar therefore depends on
orientation. However, not all objects fit into this unification scheme. Our
sample is biased towards objects known in advance to be polarized, but the
combination of our results with those of Hill, Goodrich and DePoy (1996) show
that at least 6 out of a complete, volume and flux-limited sample of 9 FR II
NLRG have broad lines, seen either in polarization or P_alpha.
