Obscured AGN have been known for a long time, in the form of Seyfert-2s
and radio-galaxies, however, the population of high-redshift, powerful,
obscured AGN (type-2 quasars) has remained elusive. The deep X-ray surveys
have found  many obscured AGN, but only  a small number of genuine
powerful, high-redshift obscured quasars. Using a combination of
mid-infrared and radio data (from Spitzer and the VLA) we have found a
successful method of finding for z>~ 2 type-2 quasars.  These obscured
quasars probably outnumber the unobscured (type-1) quasars by a ratio
~2-3:1. I will discuss the selection of these objects and what we have
learnt from optical and mid-infrared spectroscopy as well as 
multi-frequency and high-resolution radio observations. I will discuss the
possibility of quasars obscured by dust in the host galaxy instead
of the torus. Finally, I will describe a similar sample in which we find
evidence for a significant fraction of quasars which are optically thick
to Compton scattering.