  We present spectroscopic identifications for a sample of 55
submillimeter(submm)-selected `SCUBA' galaxies, lying at redshifts z=0.7 to
3.7, that were pinpointed in deep 1.4-GHz VLA radio maps. We describe their
properties, especially the presence of active galactic nuclei (AGN) in the
sample, and discuss the connection of the SCUBA galaxies and the formation of
spheroidal components of galaxies, which requires knowledge of their masses and
the timescales of their very luminous activity. For a subset of the galaxies,
we show their disturbed and diverse Hubble Space Telescope (HST) optical
morphologies.
