In the law firmsSchiff Hardin LLP added Derek G. Barella as a partner in the labor and employment practice group.Barella’s practice focuses on traditional labor matters, including collective bargaining, labor union-related issues and client representation before the National Labor Relations Board.He was previously with Winston & Strawn LLP.• Laura D. Yockey rejoined Ropes & Gray LLP’s private equity practice as counsel.She represents private equity, public company and other clients in connection …