For generations ordinary Chinese people unable to find redress for grievances have petitioned higher-level governments, all the way up to Beijing.
But their complaining embarrassed local authorities, which often bundled such individuals home and sometimes sentenced repeat petitioners to up to four years of "re-education through labour", known as laojiao.
Last November the ruling Communist Party announced the abolition of the controversial laojiao camps. Some provinces shut their sites completely while others converted them into drug rehabilitation centres, domestic media have since reported.
Authorities in the central province of Henan have been running "discipline centres" in various areas, said a report by the official news agency Xinhua posted on the website of the province's Communist Party committee overseeing law and politics.
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They had been set up to fulfil province-wide instructions issued in 2008 "to adopt various methods of education and discipline to deal with local abnormal petitioners headed to Beijing", the report said.
Many were shut in recent years, it added. "But certain areas maintained them and even took it upon themselves to hang up 'discipline centre' signs. This behaviour did not comply with legal regulations."
A month earlier she had been locked up for 10 days after petitioning in the capital, the paper cited her son as saying.
It quoted other Henan petitioners saying they had been held at discipline centres for two to six months.
A few local governments in the province described operating such centres on their websites, the Beijing News said in a separate report yesterday.