The treaty was ratified 'through the agency of' a neutral country.
He found work as a mechanic through an 'employment agency'.
an athlete who has become eligible for 'free agency'
(..) It was, rather, my final remittance that I was interested in. My last little joy. I'm sorry, Your Grace. She has arrived, but there was some confusion at the agency. They've sent a new girl who, I'm afraid, is a little older than usual. Older? Oh, dear. She's not too old, I trust? (..)2005 V for Vendetta