Those people are all in trouble because it's illegal to trade on insider information and they tracked them all down.

所有人都惹上了麻烦,因为内幕交易是非法行为,全部人都被捕了

耶鲁公开课 - 金融市场课程节选

An insider is someone who is privy to the secret information of a company and the secret information could be used to trade.

局内人掌握着公司内幕信息,这些内幕信息可以助你在交易中获利

耶鲁公开课 - 金融市场课程节选

The idea, from the beginning at the SEC, was that insiders should not be allowed to trade on information that is not properly disclosed to the public.

证交会从成立开始就规定,局内人不得利用未公开披露的信息,进行内幕交易

耶鲁公开课 - 金融市场课程节选