United Automobile Workers...has never tried a unionization drive quite like the one at the Nissan plant...[A] delegation of U.A.W. leaders and supporters will travel to Tokyo, and to Paris...to publicize a report by a Cornell University professor that asserts that Nissan’s managers have illegally threatened to close the Mississippi plant if workers vote to unionize...These efforts are largely directed at Nissan’s...chief executive...who has said the company prefers communicating with its Mississippi workers without a union...Nissan...denied that managers had made such threats. “Nissan is a company that doesn’t tolerate intimidation of employees,”...Nissan officials say the company already complies with all legal requirements on unionization efforts...But union officials warn that they will escalate their fight if they are not given equal access with Nissan.[refers to Volkswagen, Renault, General Motors, Ford, Chrysler.]