By Hilary Russ NEW YORK (Reuters) – U.S. workers and labor groups filed 57% more petitions to be represented by unions in the last six months as high-profile organizing campaigns at Starbucks Corp, Amazon.com Inc and other companies have taken off. The National Labor Relations Board (NLRB) received 1,174 such requests during the first half of its fiscal year 2022, from Oct. 1 through March 31, versus 748 during the first half of fiscal 2021, it said on Wednesday. If that pace continues for the full year, it would be the highest annual total in at least the last 10 years. “There is a surge in l…