骨干分子 meaning in English

core member

The major culprit and the core members of persons who gather to assault a railway traffic control office and pay no heed to the order to stop shall be investigated for criminal responsibility in accordance with article 158 of the criminal law
聚从冲击铁路行车调度机构不听制止的，对首要分子和骨干分子依照刑法第一百五十八条的规定追究刑事责任。
Article 63 the major culprit and the core members of persons who gather to intercept or block the way of a train and pay no heed to the order to stop shall be investigated for criminal responsibility in accordance with article 159 of the criminal law
第六十三条聚众拦截列车不听制止的，对首要分子和骨干分子依照刑法第一百五十九条的规定追究刑事责任。