Like the Blogfather said above, "Lampposts".
People’s retirement savings are a convenient source of revenue for governments that don’t want to reduce spending or make privatizations.
[. . .]
The most striking example is Hungary, where last month the government made the citizens an offer they could not refuse. They could either remit their individual retirement savings to the state, or lose the right to the basic state pension (but still have an obligation to pay contributions for it). In this extortionate way, the government wants to gain control over $14bn of individual retirement savings.
The Bulgarian government has come up with a similar idea. $300m of private early retirement savings was supposed to be transferred to the state pension scheme. The government gave way after trade unions protested and finally only about 20% of the original plans were implemented.
A slightly less drastic situation is developing in Poland. The government wants to transfer of 1/3 of future contributions from individual retirement accounts to the state-run social security system. Since this system does not back its liabilities with stocks or even bonds, the money taken away from the savers will go directly to the state treasury and savers will lose about $2.3bn a year. The Polish government is more generous than the Hungarian one, but only because it wants to seize just 1/3 of the future savings and also allows the citizens to keep the money accumulated so far.
Be sure to read the whole thing.
You can bet many a member of Congress are licking their chops, wondering how they can do this here.