NEW YORK, March 28 (Reuters) - Blackwells Capital upped

the pressure on Walt Disney ( DIS ) in a long-running boardroom

battle by suing the entertainment giant on Thursday for

information that may point to possible disclosure violations in

dealings with hedge fund ValueAct Capital.

The suit, filed in a Delaware court, is the latest chapter

in a fight over who will sit on Disney's ( DIS ) board and help guide

the home of Mickey Mouse in business and personnel decisions.

Blackwells and another hedge fund, Trian Fund Management,

are trying to persuade investors to elect their director

candidates while Disney ( DIS ) is backing its own directors.

Blackwells' suit centers around a relationship between the

entertainment company and prominent hedge fund ValueAct Capital

and an information sharing agreement the two signed earlier this

year.

Disney ( DIS ) did not immediately respond to a request for comment

from Reuters on Thursday.

Disney ( DIS ) had fully withdrawn its investment in ValueAct and

the firm no longer managed any money for the company when

ValueAct built its stake in Disney ( DIS ) last year, a person familiar

with ValueAct's business told Reuters earlier this month.

ValueAct previously managed pension fund assets for

Disney ( DIS ) and late last year began building a position in Disney ( DIS ).

Earlier this month the firm's chief investment officer and

co-chief executive, Mason Morfit, backed re-electing Disney ( DIS ) CEO

Bob Iger and the entire Disney ( DIS ) board, keeping the two hedge

funds' contenders out.

Blackwells said Disney ( DIS ) failed to properly disclose its

arrangement with ValueAct Capital and is now suing to "determine

whether wrongdoing, mismanagement, or breaches of fiduciary

duty" took place.

"The incumbent Disney Board, has not done itself any

favors by touting the agreement with ValueAct in their hopes to

sway shareholders," a Blackwells spokesperson said.

"Shareholders are entitled to full disclosure about the

ValueAct relationship including, among other things, all fees to

it by Disney ( DIS ) in the 10-year period leading up to ValueAct's

endorsement of the Board."

(Reporting by Svea Herbst-Bayliss; editing by Costas Pitas)