The N.S.A. conducts international electronic eavesdropping, but like the C.I.A., it is not supposed to spy on Americans at home.

The document describing the agreement was found by a researcher in the Center for Cryptologic History at the National Security Agency, the intelligence service that conducts electronic eavesdropping.

News reports from Sweden's state broadcast network and other sources report that FRA have in fact been conducting eavesdropping on Swedish citizens for a decade.

It is capable of intercepting traffic on a network segment, capturing passwords, and conducting active eavesdropping against a number of common protocols.

Traditionally, the F.B.I., not the N.S.A., seeks such warrants and conducts most domestic eavesdropping.

It included tougher penalties for alien smuggling and authority for the I.N.S. to conduct electronic eavesdropping.

Major Bellynck said allied soldiers conducted electronic eavesdropping along the border and were becoming adept at "distinguishing the sound of cows from the Serbs."

Enacted by a bipartisan Congress in 1978, the FISA statute was a response to revelations that the National Security Agency had conducted warrantless eavesdropping on Americans.

The National Security Agency, which conducts electronic eavesdropping for the United States, spent millions of dollars tracking the men.

The Bush Administration has acknowledged that intelligence agencies conducted warrantless eavesdropping on Americans with the help of telecom companies such as Verizon, AT&T, and Qwest.