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.

“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 to the cuts.