Billionaire Paul Singer rattled cages at aluminum giant Arconic Thursday, accusing management of buying votes to keep their jobs.

In its proxy statement this week, Arconic — led by embattled CEO Klaus Kleinfeld — disclosed that in August 2016, it reached a two-year voting agreement with investment firm Oak Hill Advisors, in which Oak Hill agreed to vote with Arconic management at future shareholder meetings.

In exchange, Arconic agreed to release claims it had on Oak Hill from a previous deal in which Arconic, which was then Alcoa, bought jet-engine parts maker Firth Rixson for $2.8 billion from Oak Hill in 2014.

The release of financial claims coupled with the lack of immediate disclosure is a breach of fiduciary duty to shareholders, Singer’s firm Elliott Management said, demanding to inspect Arconic’s books and records.

Reps for Arconic declined to comment.

Elliott, which has a 13.2 percent stake in Arconic, has been lobbying since January to oust current CEO Klaus Kleinfeld in favor of former Spirit AeroSystems CEO Larry Lawson. It has also nominated four people to Arconic’s 13-person board.

At a conference last month, Kleinfeld painted Singer’s hedge fund as Michael Corleone in “The Godfather,” characterizing its approach as “Klaus, don’t take it personal — it’s just business.”

Arconic’s shareholder meeting is scheduled for May 16.