What is the sentiment of this news? Please choose an answer from {strong negative/moderately negative/mildly negative/neutral/mildly positive/moderately positive/strong positive}.

Amazon.com Inc on Friday called for a re-run of an election after workers at a New York City warehouse voted to create the company's first U.S. union, claiming in a statement that actions by the U.S. labor board and worker-organizers suppressed the vote and denied staff their voice.
mildly negative