The Private Pension Plan Bulletin Historical Tables published by the US Department of Labor in March, 2007, documents that trend in the twenty year period (1975- 2004) that followed the establishment of the PBGC.
The diaries, made available online from the National Archives on Friday, cover the period when evidence emerged of the treachery within the British establishment in the form of the men - who would become known as the Cambridge Spies - who had spied for the Soviet Union.