New Jersey is the latest front in a battle by the government of Denmark to recoup $2.1 billion it allegedly lost to a tax fraud scheme perpetrated by retirement funds and their managers.

Denmark’s taxing authority, SKAT, has filed 40 suits in the District of New Jersey, and another 100 or more in courts across the nation since early May, to recover funds it claims to have paid out on fraudulent tax refund applications. The suits claim administrators of pension, profit-sharing and stock bonus plans falsely claimed to own stock in Danish companies and submitted fraudulent documentation to SKAT for refunds of taxes they claim were withheld on dividends from the alleged stocks.