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The fraud allegedly involved registering pensioners as members of retirees' associations without their consent, but as a result they had money regularly deducted from their benefits for the memberships.

The first open letter to be published, in early April, was signed by 1,000 air force reservists and retirees.

But with a range of incentives, from subsidies for household appliances to "silver trains" for travelling retirees, that could change.

A key target in this endeavour are retirees with potentially decades of savings.

As Levitsky exited the hall, several students and a group of retirees who are auditing the course thanked him for pushing the university to stand up to Trump.