  Historically the narrow line radio galaxies were thought to be intrinsically
nonthermal, and without significant accretion. When the Unified Model came
along the compelling observational motivation for this lost some force: some
are found to be hidden broad line objects, and in principle that could be the
case with all of them.
  The clear sign of a hidden quasar is a normal quasar spectrum in polarized
(scattered) light. However that test requires a suitably placed "mirror." A
more robust test is the high predicted mid-IR core luminosity reradiating from
the obscuring matter. Cygnus A has this component, but M87 does not.
