Cadbury shareholders will vote tomorrow on a revised offer from Kraft, but union officials said the US firm was "silent" on the workforce's future.
Unite said there was still no information on the consequences of the deal for that staff at both companies. The union called on Kraft to make its intentions clear, warning staff were "extremely worried".
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Hide AdUnite, and unions of Kraft workers in the US and Europe, claimed that the conglomerate's silence on its plans was spreading "insecurity" among workers.