Other students said he had encouraged them to reflect on what might have caused such “bad karma” to infiltrate the retreat.
It also empowered the police to infiltrate these mosques with undercover agents and informants.
He had been recruited by the Jordanian intelligence service and then taken to Afghanistan to infiltrate al Qaeda.
infiltrate in·fil·trate (ĭn-fĭl'trāt', ĭn'fĭl-)
v. in·fil·trat·ed, in·fil·trat·ing, in·fil·trates
To cause a liquid to permeate a substance by passing through its interstices or pores.
To permeate a porous substance with a liquid or gas.