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had been infiltrating

Example Sentences

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Crowley's Ordo Templi Orientis in Pasadena, California — became publicly known, Hubbard explained that he had been infiltrating the organization on the behalf of the United States military.

From Salon • Aug. 30, 2020

For well over a decade, his spies had been infiltrating the United States, burrowing their way into private companies, schools, laboratories, and even government offices.

From "Spies: The Secret Showdown Between America and Russia" by Marc Favreau