  With the Spitzer Space Telescope Infrared Spectrograph (IRS) we have observed
seven powerful FR2 radio galaxies and seven quasars. Both samples, the galaxies
and the quasars, are comparable in isotropic 178 MHz luminosity (10^26.5 W/Hz <
P 178MHz < 10^29.5 W/Hz) and in redshift range (0.05 < z < 1.5). We find for
both samples similar distributions in the luminosity ratios of high- to
low-excitation lines ([NeV] 14.3 mu / [NeII] 12.8 mu) and of high-excitation
line to radio power ([NeV] 24.3 \mu / P 178MHz). This solves the long debate
about the apparent difference of quasars and radio galaxies in favor of the
orientation-dependent unified schemes. Furthermore, the luminosity ratio [OIII]
500.7 nm / [OIV] 25.9 mu of most galaxies is by a factor of ten lower than that
of the quasars. This suggests that the optical emission from the central NLR is
essentially absorbed (A_V} > 3) in the powerful FR2 galaxies and that the
[OIII] 500.7 nm luminosity does not serve as isotropic tracer for testing the
unified schemes.
