Police are fighting to keep a neo-Nazi group leader locked up, citing fears of escalating violence after he and his followers allegedly attacked an Aboriginal protest site.

White nationalist Thomas Sewell, 32, applied for bail at Melbourne Magistrates Court today after spending the night behind bars following his arrest outside the court.

He has been charged with 25 offences, including violent disorder and affray after being interviewed over the alleged attack on Camp Sovereignty at King's Domain in the city centre on Sunday.

Prosecutor Jonathon McCarthy asked the magistrate to deny Sewell's release on bail, arguing he posed an "unacceptable risk to society" because his violence had been increasing.

He was on bail when he allegedly committed the offences and police sought to revoke tha

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