An attorney representing a group of Goldman Sachs shareholders has demanded the board investigate the New York-based investment bank’s involvement in a $4.5 billion bribery and money-laundering scheme tied to Malaysia’s sovereign wealth fund.

The Delaware plaintiffs firm Grant & Eisenhofer sent a May 3 letter on behalf of two Cleveland-based pension funds, calling for an internal investigation and possible litigation against current and former Goldman directors for failing to prevent the scandal, which stemmed from three bond deals the firm facilitated on behalf of 1Malaysia Development Berhad in 2012.