Beloved coffee chain Starbucks (NASDAQ: SBUX) is facing a brewing conflict with its workers, who are slowly starting to unionize throughout the company.

It hasn't impacted business yet, but it could at some point. Here is why investors should remain cautious about the coffee giant's increasingly hot labor situation.

Time has flown by since the first Starbucks store voted to unionize last December. Things have progressed; approximately 182 stores have successfully formed unions, 35 failed, and 96 votes remain open.

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Source Fool.com