窃据要津qiè jù yào jīn

craftily seize key posts;unjustly occupy a high post; usurp a high (/important) post
❍ 若夫暗藏之汪精卫，则招摇过市，～；匿影藏形，深入社会。(《毛泽东选集》680) The latter are either craftily seizing key posts and swaggering about,or working obscurely and worming their way into all walks of life.

窃据要津qiè jù yào jīn

津：渡口。要津：喻重要的地位。比喻利用不正当的手段占据重要地位和职权。