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Union chief returned after bitter campaign seen as proxy war for future of Labour
Gerard Coyne is challenging Unite’s Len McCluskey, a long-time Corbyn supporter
Coyne faces tough task to unseat McCluskey as leader of biggest trade union
Len McCluskey took action against leadership rival for speaking at a gathering of MPs
The latest leadership contest at Unite offers a chance for change
Union battle likely to be proxy war for control of Labour party
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