Police will be able to ban people from public places and events without a judge's approval as part of a raft of anti-organised crime legislation proposed by the state government.

A bill unveiled by the state government on Tuesday aims to "cripple" organised crime groups by clamping down on their movements, associations and business dealings.

NSW Police Commissioner Andrew Scipione has announced new laws targeting organised crime gangs. Credit:Dallas Kilponen

But critics warn the laws could lead to an overreach of police powers.

Under the legislation police will be able to apply to judges for "crime prevention orders" that would stop people involved in serious criminal activity from activities such as using a phone or a computer.