He was subject to significant invigilation by the security services, and his second wife was in fact an agent of the communist secret police.
From the en.wikipedia.org
Critics complain that such invigilation will eventually lead to the establishment of a global super-cop with the power to pry, unchecked, into people's private affairs.
From the economist.com
This includes refusing to cover for absent colleagues, banning exam invigilation and a strict limit on classroom observation of teachers for performance pay.
From the independent.co.uk
Most galleries in London, and across the UK, Europe and beyond, use similar systems throughout their rooms because we believe this to be a more effective and reliable means of invigilation.
From the guardian.co.uk
For instance, US work on fall-out in the 1960s showed that if results from different laboratories were to be combined into a reliable whole this degree of QC invigilation was necessary.
From the guardian.co.uk
More examples
Keeping watch over examination candidates to prevent cheating