We present a multiwavelength analysis of the properties of
Extremely Red Galaxy populations, selected in the GOODS-South/Chandra Deep
Field South field. By using all the photometric and spectroscopic
information available on samples of Extremely Red Objects, Distant Red
Galaxies and IRAC Extremely Red Objects, we derive redshift distributions,
identify AGN powered and Star-formation powered galaxies, and, using the
radio observations of this field, estimate robust (AGN and dust unbiased)
Star Formation Rate Densities for these populations. We find a significant
overlap between these populations of Extremely Red Galaxies, and
investigate the properties of ``pure'' (e.g., EROs that are not DRGs) and
``combined'' (e.g., galaxies that are both EROs and IEROs) sub-populations.
We find that extremely red galaxies with no AGN activity display intense
star-formation rates, up to ULIRG levels, and that the star-formation rate
density from these populations can substantially increase previous
estimates. We detect a clear tendency for the reddest objects to emit more
strongly at radio frequencies, and that a proper and comprehensive
separation between galaxies and AGNs is necessary to obtain meaningful
results.