  We present centimeter-band total flux density and linear polarization light
curves illustrating the signature of shocks during radio band outbursts
associated in time with gamma-ray flares detected by the Fermi LAT. The general
characteristics of the spectral evolution during these events is well-explained
by new radiative transfer simulations incorporating propagating oblique shocks
and assuming an initially turbulent magnetic field. This finding supports the
idea that oblique shocks in the jet are a viable explanation for activity from
the radio to the gamma-ray band in at least some gamma-ray flares.
