extortion

extortion
/ɪkˈstɔ:ʃən; ɪk`stɔrʃən/ n
1 [U] action of extorting 强夺; 强抢; 勒索; 敲诈
    obtain money by extortion 勒索金钱.
2 [C] instance of this 强夺; 强抢;勒索; 敲诈.

牛津英汉双解词典