They have a case against their directors for breach of fiduciary duty.

他们对董事们违反信托责任提出诉讼。

《柯林斯英汉双解大词典》

Trustee's any breach of the fiduciary duties will result in the loss of settler's fiduciary interests, so he must take the compensatory duty.

受托人违反信赖义务将导致委托人信赖利益的损失，因而应当承担赔偿责任。

youdao

In short, the statute applied to any notional breach of fiduciary duty--whatever its boundary or legal source.

FORBES: Magazine Article

Giddens has said that he may sue Corzine and other former executives for negligence and breach of fiduciary duty.

WSJ: MF Global trustee criticizes Corzine, execs

The alleged causes of actions include breach of fiduciary duty, unjust enrichment, unfair competition, excessive executive compensation and self-dealing transactions.

FORBES: California Sues 'Nonprofit Entrepreneur' Roger Chapin And Charity Forbes Exposed