Does the elimination of terrorist leaders always destroy their organisations?

The decapitation strategy of killing Osama Bin Laden has severe limitations.

As news of Osama Bin Laden's death changed from rumour into hard fact, and as celebrations (and relief) started to break out across the world, security analysts and experts began debating the effect that the terrorist's death would have on al-Qaeda and its terrorist affiliates.

While insurgent sources in Yemen told AFP that President Obama's success was "a catastrophe" for them, others downplayed Bin Laden's importance, the counterinsurgency expert Fredrick Kagan writing that the al-Qaeda leader's demise "does not, however, mark the end of the struggle against al Qaeda itself". Senior officials on both sides of the Atlantic have also warned about possible reprisals.

Past historical experience is also ambiguous about the impact of leadership decapitation. The classic example is the capture of the Shining Path leader Abimael Guzmán in Peru in 1992, which led to the subsequent surrender of 6,000 paramilitaries a year later. The terrorist movement, which at its peak controlled much of the countryside and was viewed as a grave threat to the central government, never recovered from these setbacks, splintering into two factions and retreating into the mountainous regions.

However, insurgent activity in Iraq did not peak until early 2007, three years after the capture of Saddam Hussein and a year after the death of Abu Musab al-Zarqawi, the then head of al-Qaeda in Iraq.

Research by Dr Andrew Roach of Glasgow University and the economist Paul Omerod suggests that the elimination of terrorist leaders has less of an effect than that of better-connected subordinates. Using network theory to simulate religious dissent in medieval Europe, they found that the most effective control techniques were the targeting of "hubs", individuals who were active in recruiting new members and running networks at a local and regional level.

In the case of the head of al-Qaeda, Roach contends that "Bin Laden's role as a hub was severely limited because of the difficulty he had in using any electronic communication".

John F McCreary, of the chief analysis office of KGS Security and author of the respected NightWatch Newsletter, believes that although a decapitation strategy is good for punishing individual terrorists, it is only one part of the solution. He warns that even small-scale groups usually have replacements lined up in advance, and notes: ''In Afghanistan the US has targeted mid-level insurgent leaders in specific districts, but the districts have never gotten more peaceful after the loss of the latest leader."

McCreary believes that counterterrorist policy should also focus on destroying the support infrastructure that terror groups depend on to supply and to renew themselves. This includes their funding, recruitment, supply lines and local support (the securing of which is also an important element of counterinsurgency theory). In his view, US commanders in Afghanistan need to spend more time on disrupting enemy logistics, especially those from Pakistan, which McCreary calls a "pipeline that the Taliban and their agents tap continuously".

However, even though Bin Laden's death may have little immediate impact on a purely tactical level, it provides justice for his victims in America and the rest of the world. It may also provide a reality check to those looking to imitate him. As Roach points out, "From being a talismanic, elusive fugitive he suddenly looks rather less heroic, and an already very loose-knit organisation loses one of its major unifying factors."

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Sadiq Khan is probably London's new mayor - what will happen in a Tooting by-election?

There will be a by-election in the new mayor's south London seat.

At the time of writing, Sadiq Khan appears to have a fairly comfortable lead over Zac Goldsmith in the London mayoral election. Which means (at least) two (quite) interesting things are likely to happen: 1) Sadiq Khan is going to be mayor, and 2) there is going to be a by-election in Tooting.

Unlike the two parliamentary by-elections in Ogmore and Sheffield that Labour won at a canter last night, the south London seat of Tooting is a genuine marginal. The Conservatives have had designs on the seat since at least 2010, when the infamous ‘Tatler Tory’, Mark Clarke, was the party’s candidate. Last May, Khan narrowly increased his majority over the Tories, winning by almost 3,000 votes with a majority of 5.3 per cent. With high house prices pushing London professionals further out towards the suburbs, the seat is gentrifying, making Conservatives more positive about the prospect of taking the seat off Labour. No government has won a by-election from an opposition party since the Conservative Angela Rumbold won Mitcham and Morden from a Labour-SDP defector in June 1982. In a nice parallel, that seat borders Tooting.

Of course, the notion of a Tooting by-election will not come as a shock to local Conservatives, however much hope they invested in a Goldsmith mayoral victory. Unusually, the party’s candidate from the general election, Dan Watkins, an entrepreneur who has lived in the area for 15 years, has continued to campaign in the seat since his defeat, styling himself as the party’s “parliamentary spokesman for Tooting”. It would be a big surprise if Watkins is not re-anointed as the candidate for the by-election.

What of the Labour side? For some months, those on the party’s centre-left have worried with varying degrees of sincerity that Ken Livingstone may see the by-election as a route back into Parliament. Having spent the past two weeks muttering conspiratorially about the relationship between early 20th-Century German Jews and Adolf Hitler before having his Labour membership suspended, that possibility no longer exists.

Other names talked about include: Rex Osborn, leader of the Labour group on Wandsworth Council; Simon Hogg, who is Osborn’s deputy; Rosena Allin-Khan, an emergency medicine doctor who also deputises for Osborn; Will Martindale, who was Labour’s defeated candidate in Battersea last year; and Jayne Lim, who was shortlisted earlier in the year for the Sheffield Brightside selection and used to practise as a doctor at St George’s hospital in Tooting.

One thing that any new Labour MP would have to contend with is the boundary review reporting in 2018, which will reduce the number of London constituencies by 5. This means that a new Tooting MP could quickly find themselves pitched in a selection fight for a new constituency with their neighbours Siobhan McDonagh, who currently holds Mitcham and Morden, and/or Chuka Umunna, who is the MP for Streatham. 

According to the Sunday Times, Labour is planning to hold the by-election as quickly as possible, perhaps even before the EU referendum on June 23rd.

It's also worth noting that, as my colleague Anoosh Chakelian reported in March, George Galloway plans to stand as well.

Henry Zeffman writes about politics and is the winner of the Anthony Howard Award 2015.