Nov 5 (Reuters) - Unionized baristas at Starbucks ( SBUX )

in the U.S. are preparing to go on strike next week and

disrupt one of the coffee chain's busiest days, Bloomberg News

reported on Wednesday.

Starbucks Workers United said members voted to give

leadership the ability to call for a work stoppage at any time,

according to the report.

Reuters could not immediately verify the report.

(Reporting by Chandni Shah in Bengaluru)