Wall Street Journal: Union leaders are pressing to increase their ranks and secure gains for their members as workers demand more from their employers and as companies struggle with labor shortages and snarled supply chains. A walkout by production workers for farm and construction machinery company Deere & Co. that began Thursday followed recent stoppages at snack producer Mondelez International Inc., commercial truck maker Volvo and breakfast-cereal giant Kellogg Co. Labor leaders elsewhere this year have worked to unionize Starbucks Corp. baristas and Amazon.com Inc. warehouse workers, so far with mixed success. Union officials said workers are motivated by lingering frustration over their hours, pay and concerns for their health as some have held front-line jobs through the COVID-19 pandemic. Employees this year have pushed for higher wages, expanded benefits, safer workplaces and added staffing.