  We identify a population of Luminous Compact Blue Galaxies (LCBGs) in two
galaxy clusters: MS0451.6-0305 (z=0.54) and Cl1604+4304 (z=0.9). LCBGs are
identified via photometric characteristics and photometric redshifts derived
from broad and narrow band images taken with the WIYN telescope and the Hubble
Space Telescope. We analyze their surface densities and clustering properties
to find they compose a statistically significant portion (42% and 53%) of the
Butcher-Oemler galaxies in both clusters, and their spatial distributions are
best characterized by a shell model. The enhancement of the projected
space-density of LCBGs with M_B<-18.5 in the clusters relative to the field is
3-10 times higher than the BO population as a whole, but 2 times lower than the
red population, except in the core where LCBGs are absent. Assuming some
fading, a natural descendant would be small, low-luminosity galaxies found
preferentially in today's clusters, such as dEs.
