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}.
Text: Apple Inc. investors, concerned about growing charges of unfair labor practices against the tech giant, on Wednesday filed a shareholder proposal asking for an independent assessment of the company's commitment to workers' freedom of association and collective-bargaining rights.
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moderately negative
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