The NLRB has ruled that a Connecticut McDonald’s franchisee unlawfully fired workers for union activity in 2020. The franchisee furloughed many employees with the onset of COVID-19 and called them all back to work a few weeks later, except for four union supporters. The four fired workers participated in a public union campaign prior to the pandemic. The Administrative Law Judge for the case ordered that the workers be reinstated and given backpay.
See "McDonald’s workers fired for union activities win their case", Ian Kullgren, Bloomberg Law, January 4, 2022