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Saruman didn't spend all his time in Isengard. We know he visited Minas Tirith and he was part of the White Council ... so he must have attended the meetings. We also know that he participated in the attack on Dol Guldur, so he got around a bit.
I wonder if he'd ever visited Rivendell? Elrond would have had no reason to turn him away.
What I'm saying is - he probably knew of more people than we think! Remember, he was interested in the One Ring ... Bilbo found the Ring and Gloin was one of his companions... it's not inconceivable that Saruman knew something of this, given his interest.
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