Do general strikes achieve anything?

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Greece will today experience its 20th general strike since the eurozone crisis got serious in 2010. So what do the strikers hope to achieve by bringing the country to a standstill? Justin Rowlatt speaks to Gregor Gall, professor of Industrial Relations at the University of Hertfordshire. Meanwhile, European Union leaders have had even more crisis summits than Greece has had general strikes. Today sees the 22nd since 2010. This one is focused on banking union and the fears of many leaders that momentum is slowing. That's in part becasue of fears about the impact it will have on the 10 nations that don't use the euro. Plus: a currency union with a difference, one that actually works.