Amazon warehouse workers at multiple locations face higher risks of developing injuries from straining themselves on the job, according to federal safety regulators.   The Department of Labor's workplace safety agency wrote citations for three warehouses, located in New York, Colorado, and Idaho, saying that workers there had to repeatedly handle heavy items and work fast, posing a "high risk of serious" injury.  "Instead of fighting federal orders to design truly safe jobs, Amazon must start by admitting that its business model prioritizes speed and profit over safety," said Eric Frumin, Health and Safety Director at the Strategic Organizing Center, a group of worker unions, in a statement on Wednesday