  We discuss the link between the observations of distant quasars and those of
massive dark objects in the cores of many local galaxies. We show how the
formation of early black holes gives rise to the luminosity function of high z
quasars, while it imprints into their dark local relics a related shape of the
mass-dispersion correlation. We propose that in its lower section the
correlation slope will tell the (otherwise uncertain) strenght of the feedback
effect from the quasar radiation on the host galaxies.
