The sisters of a Chinese rights activist who died in detention in the southern city of Guangzhou earlier this month were summoned on Tuesday by local authorities after they responded angrily to news of his death, Radio Free Asia (RFA) reports. The family said the summons — for “picking quarrels and stirring up trouble” — was designed to intimidate them. “I think they are afraid that we will expose the truth, and that’s why they want to detain us,” Zhang Wuzhou told RFA. When authorities reported that her brother Zhang Liumao died in police custody early on Nov.