《后汉书·列传·酷吏列传》
这时，赵、魏豪强聚集一起，清河大姓赵纲就于县界筑坞壁，修造兵器，危害地方。
时赵、魏豪右往往屯聚，清河大姓赵纲遂于县界起坞壁，缮甲兵，为在所害。
At this time, the powerful clans of Zhao and Wei had gathered together. Zhao Gang, the leading family of the powerful clans in Qinghe, had built a fortress at the border of the county, and had weapons made, posing a threat to the region.