Scott Shane writes: A diabolical range of recent attacks claimed by the Islamic State — a Russian airliner blown up in Egypt, a double suicide bombing in Beirut and Friday’s ghastly assaults on Paris — has rekindled a debate over the proper limits of government surveillance in an age of terrorist mayhem.

On Monday, in unusually raw language, John Brennan, the C.I.A. director, denounced what he called “hand-wringing” over intrusive government spying and said leaks about intelligence programs had made it harder to identify the “murderous sociopaths” of the Islamic State.

Mr. Brennan appeared to be speaking mainly of the disclosures since 2013 of the National Security Agency’s mass surveillance of phone and Internet communications by Edward J. Snowden, which prompted sharp criticism, lawsuits and new restrictions on electronic spying in the United States and in Europe.

In the wake of the 129 deaths in Paris, Mr. Brennan and some other officials sounded eager to reopen a clamorous argument over surveillance in which critics of the spy agencies had seemed to hold an advantage in recent years.

“As far as I know, there’s no evidence the French lacked some kind of surveillance authority that would have made a difference,” said Jameel Jaffer, deputy legal director of the American Civil Liberties Union. “When we’ve invested new powers in the government in response to events like the Paris attacks, they have often been abused.”

The debate over the proper limits on government dates to the origins of the United States, with periodic overreaching in the name of security being curtailed in the interest of liberty. This era of Al Qaeda and the Islamic State in some ways resembles battles that American and European authorities fought in the late 1800s with anarchists who carried out a wave of assassinations and bombings, provoking a huge increase in police powers, said Audrey Kurth Cronin, a historian of terrorism at George Mason University.

Since then, there were the excesses of McCarthyism exploiting fears of Communist infiltration in the 1950s, the exposure of domestic spying and C.I.A. assassination plots in the 1970s, and the battles over torture, secret detention and drone strikes since Sept. 11, 2001. [Continue reading…]