investigative journalism
US /ɪnˌvestɪˈɡeɪtɪv ˈdʒɜːrnəlɪzəm/
UK /ɪnˌvestɪˈɡeɪtɪv ˈdʒɜːrnəlɪzəm/
1.
a form of journalism in which reporters deeply investigate a single topic of interest, such as serious crimes, political corruption, or corporate wrongdoing
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The newspaper won an award for its investigative journalism on local government corruption.
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Good investigative journalism often leads to significant social change.