Extragalactic Jets as Probes of Distant Clusters of Galaxies and the
  Clusters Occupied by Bent Radio AGN (COBRA) Survey
  We are conducting a large survey of distant clusters of galaxies using radio
sources with bent jets and lobes as tracers. These radio sources are driven by
AGN and achieve their bent morphologies through interaction with the
surrounding gas found in clusters of galaxies. Based on low-redshift studies,
these types of sources can be used to identify clusters very efficiently. We
present initial results from our survey of 653 bent-double radio sources with
optical hosts too faint to appear in the SDSS. The sample was observed in the
infrared with Spitzer, and it has revealed $\sim$200 distant clusters or
proto-clusters in the redshift range $z\sim0.7 - 3.0$. The sample of
bent-doubles contains both quasars and radio galaxies enabling us to study both
radiative and kinetic mode feedback in cluster and group environments at a wide
range of redshifts.
