They were desperate to have their voices heard when lead poisoning destroyed their health and families, but now they have fallen prey to another source of suffering - a government crackdown.
At least seven people from Shaanxi's Fengxiang county are in jail more than four months after protests against lead pollution which left hundreds of children sick.
The demonstrations erupted in early August as the scale of the public health emergency caused by the Dongling Lead and Zinc Smelting Plant became clear.
One of those who remains behind bars for the August 17 unrest is Ma Weibo, a 26-year-old worker at a nearby power plant.
'In the evening, exactly a week after the demonstration, five policemen from different levels of public security bureaus including Baoji city, Fengxiang county and Changqing township came over and detained my eldest son,' said his father, Ma Changxiong, a peasant in Madaokou village.
'The police told me that they had identified him as one of the leading figures of the riot, with the help of closed-circuit television.'