permeate, pervade, penetrate, invade; see filter 1, insinuate 2, join 2.
"infiltrate." YourDictionary, n.d. Web. 12 October 2018. <http://thesaurus.yourdictionary.com/infiltrate>.
infiltrate. (n.d.). Retrieved October 12th, 2018, from http://thesaurus.yourdictionary.com/infiltrate
To introduce gradually and slyly:
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