近亲繁殖

Explanation: Refers to the close genetic relationship between individuals breed livestock. Can be used for leading cadres within the scope of rights in their own cronyism 　　Usage: The main predicate; as subject, object; containing derogatory 　　Source: Zhang Zhou, "China gets tough," Chapter: "province, a county party secretary said that due to years of inbreeding, if the investigation of a section-level cadres, it will offend half the county."