SummaryCompaniesTeamsters call for Thursday strikeThousands of workers will participate, union saysTeamsters represent around 1% of Amazon's US workforceDec 18 (Reuters) - Thousands of Amazon.com (AMZN.O), opens new tab workers will walk off the job on Thursday morning, in the crucial final days of the holiday season, after union officials said the retailer failed to come to the bargaining table to negotiate contracts.The strike is a challenge to Amazon's operations as it races to fulfill orders...