[Noxomanus]

Maybe this wasn't exactly the good formulation of my question,as it better had been like "Did Sauron know about all of the Istari?" While Saruman & Gandalf were most suspicious,Saruman being well-known for his wisdom and living in conspicious Isengard in that remarkable tower of Orthanc,and Gandalf who travelled widely,was close to the Elves,interfering all over and driving Sauron out of Dol Guldur TWICE.But I wonder if he really knew about Radagast or the Blue Wizards,while the latter,if they really made easterlings rebel on Sauron,might have been known to him,I wonder wether he really knew the somewhat ignorant and little known Radagast who seems to have forsaken his mission. Perhaps this meant Radagast escaped the attention of the Dark Lord. I don't know if this would be the case if Radagast took an active role in the attack of the White Council on Dol Guldur however.