infiltrate
verb (used with object)
to filter into or through; permeate.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“Even if an intelligence service could infiltrate a dozen cells, it would have to assume they knew what uninfiltrated cells were planning, and be able to rely on it,” he continued.
From New York Times ● Jan. 13, 2010