  We study the moderate-to-high radiative luminosity active galactic nuclei
(HLAGN) within the VLA-COSMOS 3 GHz Large Project. The survey covers 2.6 square
degrees centered on the COSMOS field with a 1$\sigma$ sensitivity of 2.3
$\mathrm{\mu Jy}$/beam across the field. This provides the simultaneously
largest and deepest radio continuum survey available to date with exquisite
multi-wavelength coverage. The survey yields 10,830 radio sources with
signal-to-noise ratios $\geq$5. A subsample of 1,604 HLAGN is analyzed here.
These were selected via a combination of X-ray luminosity and mid-infrared
colors. We derive luminosity functions for these AGN and constrain their cosmic
evolution out to a redshift of $z\sim6$, for the first time decomposing the
star formation and AGN contributions to the radio continuum emission in the
AGN. We study the evolution of number density and luminosity density finding a
peak at $z\sim1.5$ followed by a decrease out to a redshift $z\sim6$.
