Here's Martin Peretz describing the "fellow travellers" of history's failed revolutions, people in the US and the west who have sympathised and worked for one failed revolution after another, still with a need to move on to the next cause:
But move on they would, armed as always — as author David Caute put it — with their usual arsenal of "bifocal lenses, double standards, a myopic romanticism."
Of course, there is now no world revolution into which these deluded folk can vest their ardors, as yesteryear's fellow travelers did when extolling the nonexistent — but exemplary — democratic virtues of Stalin's Russia or of some other transformatory idyll. Only certified kooks are in the business these days of changing the nature of man.
So the present-day romantics, who at home typically despise the idea of the nation-state and the realities of national interest, are left with often contrived and almost always murderous nationalisms to adore. The nationalism du jour is Palestinian nationalism.