No. I actually heard the quote broadcast on Glen Beck’s show a while back. Miltojn Friedman, in a Seante session had just remonstrated with the audience that socialism had failed in every case where it had been tried in the last 6000 years. That quote was Kennedy’s arrogant response.
What a monster.
And why “6,000 years”? Socialism hasn't been an active political system anywhere near that long.