There was a bureau chief who, just before a promotion, found that the mayor had changed, and personnel transfers were frozen.

After waiting three or four months, they discussed the cadre promotion issue, and his name was gone.
Originally, his position was taken over by someone the new mayor favored. He was furious and decided to retaliate. So he started collecting evidence.
First, the person who replaced him, who had been in the role for half a year, was truly incompetent and did a terrible job. He gathered a bunch of evidence, submitted it, and also mobilized a few “public” voices to reflect the issues.
But there was no response at all. He judged that the new mayor had manipulated behind the scenes. So he began collecting problems about the mayor himself, assembling a large pile of materials.
This time, he was more cautious, inquiring everywhere, and discovered that the new mayor was the second-in-command at his previous position, had conflicts with the top leader, and the two caused issues in daily operations.
They even took their disputes to the provincial level, ending up with both sides splitting 50-50, and both were transferred laterally.
The mayor had connections in the province, so this old guy laid low.
He waited for several years, collected two boxes of materials, and even after being promoted to a new position himself, he still persisted in gathering evidence.
Until the central government began large-scale inspections, with the province being a key area and receiving significant attention.
He drove himself, with a determined spirit, carrying the materials to report at the inspection team’s hotel.
He reported all night, and the inspection team leader personally received him, asking why, as a deputy department-level official, he hadn’t been sidelined and why he still had many issues (this guy listed his past problems and the money he had taken).
He explained that first, it was to vent his anger, and second, he realized the central government’s crackdown was very strong, and everyone needed to pass the test.
In the end, he was promoted two years ahead of schedule to the second tier, without being demoted.
Everyone else was sent away.