Chinese security agents raided the offices of a leading human rights organization...the latest sign of the authorities’ mounting hostility toward nongovernmental groups, especially those that receive foreign funding or promote civic activism...about two dozen police officers on Tuesday raided the Beijing Yirenping Center, which champions gender equality and employs litigation to fight discrimination against people with H.I.V., hepatitis and physical disabilities...They...are being held on suspicion of “picking quarrels and provoking troubles,” a charge that has been used with increasing frequency against those the government considers potential threats to social stability...The Beijing Public Security Bureau did not respond to requests for comment, and the Foreign Ministry has dismissed expressions of concern from overseas...Most at risk are groups that rely on foreign support, which describes the vast majority of Chinese organizations dedicated to social justice...