  We select a sample of 1,437 active galactic nuclei (AGN) from the catalog of
the Sloan Digital Sky Survey (SDSS) galaxy properties from the Portsmouth group
by detection of the high-ionization [Ne V] 3426 \r{A} emission line. We compare
the fluxes of [Ne III] 3869 \r{A}, [O III] 5007 \r{A}, [O II] 3726, 3728 \r{A},
and [O I] 6300 \r{A} to that of [Ne V]. All four lines show a strong linear
correlation with [Ne V], although lines from ions with lower ionization
potentials have a lower correlation coefficient. We investigate the use of two
forbidden-line ratio (FLR) diagnostic diagrams that do not rely on H$\alpha$ in
order to classify high redshift galaxies. These use the [Ne III]/[O II] line
ratio plotted against [O III]/[O I] and [O III]/[O II] respectively. We use
photo-ionization modeling to characterize the behavior of the narrow-line
region in AGN and star-forming regions and test the validity of our diagnostic
diagrams. We also use a luminosity cutoff of log L[OIII] [erg/s] = 42, which
lowers the contamination of the AGN region by star-forming galaxies down to 10%
but does not remove Green Pea and Purple Grape galaxies from the AGN region. We
also investigate the OHNO diagram which uses [Ne III]/[O II] plotted against [O
III]/H$\beta$. Using our new diagnostic diagrams, we are able to reliably
classify AGN up to a redshift of z $\leq$ 1.06, and add more than 822 new AGN
to the [Ne V]-selected AGN sample.
