(~s, infiltrating, ~d)
1.
If people ~ a place or organization, or ~ into it, they enter it secretly in order to spy on it or influence it.
Activists had ~d the student movement...
A reporter tried to ~ into the prison.
VERB: V n, V into/from n
infiltration (infiltrations)
...an inquiry into alleged infiltration by the far left group...
N-VAR
2.
To ~ people into a place or organization means to get them into it secretly in order to spy on it or influence it.
Some countries have ~d their agents into the Republic.
VERB: V n into n