1.   The drugs are supplied through an underground network.

2.   An underground network of photographers called the Hidden Camera, led by Fritz Kahlenberg, documented it all.

3.   And according to Michael W. Cuneo, a Fordham University sociologist, there is an underground network of exorcisms being performed in this country.

4.   As the underground network spread, assignments were divvied up.

5.   Abortion-rights advocates believe that the latest arrests provide strong evidence that there is an extensive underground network of anti-abortion extremists to support those who commit violence.

6.   Agents have examined whether he might have been involved in drug trafficking or had received support from an underground network of far-right paramilitary groups.

7.   Converts keep in touch with one another by a kind of underground network and eagerly await news from the Two.

8.   Customs said its agents had infiltrated the underground network and discovered that most of the counterfeit components were made in Vietnam, China, Taiwan and Thailand.

9.   Even Warsaw, after decades of delays, now has an underground network.

10.   For generations, there has been a small underground network of Southern Italians who have preserved their cuisine by re-creating touches of it here in New York.