During the last decade, several observational evidences have been accumulated for the existence of massive, high velocity winds/outflows (aka UFOs) in nearby AGNs and, possibly, distant quasars. I will review here such evidences and discuss their relevance for both understanding the physics of accretion/ejection flows on supermassive black holes, and for quantifying the amount of feedback from AGNs in their host galaxies/group/clusters.