"We have filed a case of sedition against Hardik Patel for his October 3 comments here telling his friends to kill policemen," DCP Marland Chauhan, who has become a complainant in the case, said.
The sedition case has been filed under section 124(A) of IPC at Amroli police station in the city.
In a controversial remark in Surat, Hardik, the 22-year-old fiery leader, had allegedly advised a youth from the community to kill policemen rather than commit suicide.
Hardik visited Desai's house accompanied by a team of a news channel which had aired the conversation later.
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This complaint against Hardik comes after almost 15 days of his controversial remarks.
The quota spearhead has been hogging the limelight since the August 25 "mega-rally" of Patels in Ahmedabad and the subsequent violence across Gujarat.
Hardik was detained yesterday in Rajkot ahead of India- South Africa third ODI, as he had threatened to protest during the match for quota for his community. He is still under detention of Rajkot Police.