The Market Basket board voted unanimously late Tuesday night to remove Arthur T. Demoulas as president and CEO of the beloved New England supermarket chain that has been caught up in a yearslong family feud over its ownership.

The move comes after failed mediation to resolve differences between the two parties.

In May, the board placed Demoulas and five other employees on paid leave while it launched an investigation into what it called “credible allegations” that Demoulas planned to disrupt Market Basket’s business operations with a work stoppage. The board’s executive committee alleged the stoppage plan was “improper retaliation” for directives the board had given Demoulas last year.

/The situation was complicated by the fact that two of the employees put on leave were Demoulas’

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