 He is best known for accusing people of abuses in official family-planning practices, often involving claims of violence and forced abortions.In 2005, Chen gained international recognition for organising a landmark class-action lawsuit against authorities in Linyi, Shandong province, for the excessive enforcement of the one-child policy.As a result of this lawsuit, Chen was placed under house arrest from September 2005 to March 2006, with a formal arrest in June 2006.