In a scene reminiscent of old-fashioned labor activism, workers and their supporters marched Tuesday through Los Angeles International Airport and in airports and restaurants across the U.S., demanding higher pay and union representation for low-wage workers.

The protests were peaceful, but they may just be a prelude of battles to come, as unions face a new administration in Washington and efforts to roll back labor victories.

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Trump’s plans to cut taxes sharply for those with high incomes could make the issue of raising the lowest wage “more powerful and compelling,” said William Gould IV, a professor emeritus at Stanford Law School, current chairman of the California Agricultural Labor Relations Board and a former chairman of the NLRB.

“In an era of inequality, it seems to me that will provide more fuel to organizations representing low-income people,” he said.