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Although the radio emission from most quasars appears to be associated withstar forming activity in the host galaxy, about ten percent of opticallyselected quasars have very luminous relativistic jets apparently powered by aSMBH which is located at the base of the jet. When these jets are pointed closeto the line of sight their apparent luminosity is enhanced by Doppler boostingand appears highly variable. High resolution radio interferometry showsdirectly the outflow of relativistic plasma jets from the SMBH. Apparenttransverse velocities in these so called blazars are typically about 7c butreach as much as 50c indicating true velocities within one percent of the speedof light. The jets appear to be collimated and accelerated in regions as muchas a hundred parsecs downstream from the SMBH. Measurements made with Earth tospace interferometers indicate apparent brightness temperatures of about 10E14K or more. This is well in excess of the limits imposed by inverse Comptoncooling. The modest Doppler factors deduced from the observed ejection speedsappear to be inadequate to explain the high observed brightness temperatures interms of relativistic boosting.

Radio Evidence for AGN Activity: Relativistic as Tracers of SMBHs