  We examine the black hole mass - galaxy bulge relationship in high-redshift
QSOs. Black hole masses are derived from the broad emission lines, and the host
galaxy stellar velocity dispersion sigma is estimated from the widths of the
radio CO emission lines. At redshifts z > 3, the CO line widths are narrower
than expected for the black hole mass, indicating that these giant black holes
reside in undersized bulges by an order of magnitude or more. The largest black
holes (above 10^9 solar masses) evidently grow rapidly in the early universe
without commensurate growth of their host galaxies. CO line widths offer a
unique opportunity to study AGN host galaxy dynamics at high redshift.
