Bernie Sanders just wrote a letter to Fed Chair Janet Yellen asking why she is doing nothing as the European Central Bank destabilizes Greece’s newly elected Syriza government.

Several weeks ago the Greek people voted for a new government. This government canceled the privatization of key public assets, raised the minimum wage, and restored electricity to the needy. This government is seeking to restructure its relationship with the European Union to encourage economic growth in Greece and to escape from a deflationary cycle.

Recently, the European Central Bank (ECB) announced that it will no longer accept Greek official debt as collateral for loans to financial institutions in that country on the grounds that the new government is not following the dictates of the previous, failed policies. This move had an immediate destabilizing effect on the U.S. and world markets, and further moves could provoke a run on the Greek banking system in the days or weeks ahead.

The United States cannot stand idly by while the European Central Bank undermines the new democratically elected government of Greece, induces deflation and risks financial instability. President Barack Obama was right when he recently noted, with regard to Greece: “You cannot keep on squeezing countries that are in the midst of a depression. At some point, there has to be a growth strategy in order for them to pay off their debts to eliminate some of their deficits.”

It would be a terrible mistake for the world to forget what happens when a democratically-elected government, as was the case in Germany in the 1920s, is unable to relieve the severe economic suffering of its people. We must remember that waiting in the wings should this recently elected Greek government fail is the neo-Nazi Golden Dawn party. We cannot allow fascism to come to power in a European country due to our unwillingness to reverse harmful austerity policies.