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Students link arms during civil unrest in Paris, France, 30th May 1968. (Photo by Reg Lancaster/Daily Express/Hulton Archive/Getty Images)

Students link arms during civil unrest in Paris, France, 30th May 1968.  (Photo by Reg Lancaster/Daily Express/Hulton Archive/Getty Images)

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Red and black flags in a demonstration of workers and students, who are against the interruption of the general strike for what has been granted by the trade unions in terms of minimum wage and civil rights. Paris (France), May 30, 1968. (Photo by Mario De Biasi;Sergio Del Grande/Mondadori Portfolio via Getty Images)

Red and black flags in a demonstration of workers and students, who are against the interruption of the general strike for what has been granted by the trade unions in terms of minimum wage and civil rights. Paris (France), May 30, 1968. (Photo by Mario De Biasi;Sergio Del Grande/Mondadori Portfolio via Getty Images)

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Students march on the London School of Economics to protest about the installation of steel security gates, London, 27th January 1969. (Photo by P. Shirley/Daily Express/Hulton Archive/Getty Images)

Students march on the London School of Economics to protest about the installation of steel security gates, London, 27th January 1969.  (Photo by P. Shirley/Daily Express/Hulton Archive/Getty Images)

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Riots in the Quartier Latin during the May '68 protests in Paris. Here, riots at Jussieu University. (Photo by Henri Bureau/Sygma/Corbis/VCG via Getty Images)

Riots in the Quartier Latin during the May '68 protests in Paris. Here, riots at Jussieu University.   (Photo by Henri Bureau/Sygma/Corbis/VCG via Getty Images)

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Students attempt to knock through the door of a building during civil unrest in Paris, France, 30th May 1968. (Photo by Reg Lancaster/Daily Express/Hulton Archive/Getty Images)

Students attempt to knock through the door of a building during civil unrest in Paris, France, 30th May 1968.  (Photo by Reg Lancaster/Daily Express/Hulton Archive/Getty Images)