“By unionizing, hundreds of previously unrepresented employees have obtained a critical voice in their workplace and now have the power to make significant changes to benefit themselves and their colleagues.”

The vote means 600 workers at the parks, including park rangers, researchers, educators, fee collectors and first responders, among others, will be represented by the National Federation of Federal Employees (NFFE).

Labor organizers have been trying to form a union at the parks for years but did not have the necessary support until this year when the Trump administration’s mass firings left the parks service in turmoil, the Los Angeles Times reported.

“It comes as no surprise workers in the National Park Service are overwhelmingly in favor of unionizing, as federal employees across the country have been faced with reductions in force, threats to workplace protections, and slashed agency budgets under this administration,” Erwin said.

Since Trump took office this year the National Park Service, which manages 85m acres (34m hectares) of America’s public lands, has lost a quarter of its permanent staff, seasonal hiring is down and the administration is seeking to slash more than $1bn from the NPS budget.

The US interior secretary, Doug Burgum, has said the cuts were “clearing out the barn”. Despite the upheaval, the federal government has ordered parks to stay open to the public. That has left staffers scrambling to manage the parks amid the peak summer season, and, as the Guardian reported last month, archeologists are managing ticket booths while park superintendents have cleaned bathrooms.

At Yosemite, scientists were also cleaning public bathrooms because there were no other workers to do it. Amid the turmoil this year, NPS employees told the Guardian earlier this summer they had received unsigned emails from the office of personnel management urging them to resign and find a job in the private sector.

“Every day you come to work and you have no idea what is going to happen next. It’s like we are all being subjected to psychological warfare,” a staffer said this spring.

Earlier this year at Yosemite, laid-off employees hung a US flag upside down, a symbol of distress, at the park’s El Capitan to bring attention the cuts.

Erwin with the NFFE said the union would take “every step possible” to increase staffing and resources, and defend employees.

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