Yes, it is known as the Cruciatus Curse, and it causes extreme pain to who ever it is aimed at. It is one of three Unforgiveable Curses, which are illegal to use.
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Harry Potter attempted to use crucio on Bellatrix Lastrange and later used it on Amycus Carrow.
he does not use it i think he only uses the imperius curse Harry does use crucio in Harry Potter And The Deathly Hallows. He uses it defending Professor McGonagall when Amycus the death eater/teacher spat at her. It is in the chapter called: The Sacking Of Severus Snape. In the UK version it is pg.477 but I don't know about the US version sorry.
Protego.
Alohomora
Malfoy.