In its anxiety to prevent infiltration by the, enemy, the West developed thought controls of its own, which grew ever tighter.

All these work aim to facilitate the discharge of underground water and prevent infiltration.

What kind of controls do they have to prevent infiltration?

A secondary stated purpose of the barrier is to prevent infiltration by Palestinians for economic reasons.

Ostensibly, this was to prevent infiltration of any local terrorists to Earth.

The attacks came just one day after Jordan agreed to prevent armed infiltration to Israel.

Saudi officials rejected the comparison saying it was built to prevent infiltration and smuggling.

They are especially important for preventing infiltration by agents provocateurs.

We have to prevent infiltration across the border, discuss the positioning of troops and not intervene in each other's business.

Their small numbers meant they lacked influence but also allowed them to operate under the radar of the Kuomintang and prevent infiltration by other parties.