Multiculturalism promotes segregation, stifles free speech and threatens liberal democracy, Britain's top Jewish official warned in extracts from his book published Saturday. Jonathan Sacks, Britain's chief rabbi, defined multiculturalism as an attempt to affirm Britain's diverse communities and make ethnic and religious minorities more appreciated and respected. But in his book, "The Home We Build Together: Recreating Society," he said the movement had run its course. "Multiculturalism has led not to integration but to segregation," Sacks wrote in his book, an extract of which was published in the Times of London. "Liberal democracy is in danger," Sacks said, adding later: "The politics of freedom risks descending into the politics of fear."