infiltration
US /ˌɪn.fɪlˈtreɪ.ʃən/
UK /ˌɪn.fɪlˈtreɪ.ʃən/
1.
sự xâm nhập
the process of secretly becoming part of a group in order to get information or to influence the way that a group thinks or behaves:
:
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Police infiltration of Greenpeace sparked the scandal.