  We propose novel collider searches which can significantly improve the LHC
reach to new gauge bosons $Z'$ with mixed anomalies with the electroweak (EW)
gauge group. Such a $Z'$ necessarily acquires a Chern-Simons coupling to the EW
gauge bosons and these couplings can drive both exotic $Z$ decays into
$Z'\gamma$ if the new gauge boson is sufficiently light, as well as $Z'$ decays
into EW gauge bosons.While the exotic decay rate of the heavy $Z$ into
$Z'\gamma$ is too small to be observed at the LHC, for a light $Z'$, we show
the potential of a lepton jet search in association with a photon to probe the
rare decay $Z \to Z' \gamma$.
