* Works council key in future U.S. plant decisions -Osterloh
* Labour support for deals needed on supervisory board
* Osterloh sees "unfair labour praxis" by U.S. Republicans
BERLIN, Feb 19 (Reuters) - Volkswagen's top labour representative threatened on Wednesday to try to block further investments by the German carmaker in the southern United States if its workers there are not unionised.
Workers at VW's factory in Chattanooga, Tennessee, last Friday voted against representation by the United Auto Workers union (UAW), rejecting efforts by VW representatives to set up a German-style works council at the plant.
German workers enjoy considerable influence over company decisions under the legally enshrined "co-determination" principle which is anathema to many politicians in the U.S. who see organised labour as a threat to profits and job growth.
Chattanooga is VW's only factory in the U.S. and one of the company's few in the world without a works council.
"I can imagine fairly well that another VW factory in the United States, provided that one more should still be set up there, does not necessarily have to be assigned to the south again," said Bernd Osterloh, head of VW's works council.
"If co-determination isn't guaranteed in the first place, we as workers will hardly be able to vote in favour" of potentially building another plant in the U.S. south, Osterloh, who is also on VW's supervisory board, said.
The 20-member panel - evenly split between labour and management - has to approve any decision on closing plants or building new ones.
Osterloh's comments were published on Wednesday in German newspaper Sueddeutsche Zeitung. A spokesman at the Wolfsburg-based works council confirmed the remarks.
"The conservatives stirred up massive, anti-union sentiments," Osterloh said. "It's possible that the conclusion will be drawn that this interference amounted to unfair labour praxis."
Republican U.S. Senator Bob Corker, a staunch opponent of unionisation, said last Wednesday after the first day of voting that VW would award the factory another model if the UAW was rejected.
The comments even prompted U.S. President Barack Obama to intervene, accusing Republicans of trying to block the Chattanooga workforce's efforts.
Undeterred by last Friday's vote, VW's works council has said it will press on with efforts to set up labour representation at Chattanooga which builds the Passat sedan.
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