  Galaxy groups likely contain a significant fraction of the total baryonic
mass in the local universe within their intragroup medium (IGM). However, aside
from a handful of UV absorption line and X-ray observations, almost nothing is
known about the IGM. We present early results from a research program that
combines low-frequency radio continuum observations and optical spectroscopy of
bent-double radio sources and their neighbors in groups of galaxies. These
observations allow us to probe the density of the IGM to an unprecedented
degree by examining its impact on the jets of radio galaxies.
