April 6 Youth Movement (Democratic Front) has rejected a draft protest law currently being reviewed by interim president Adly Mansour.
In a statement on Monday, the prominent protest movement said the draft restricts freedom of assembly and is not supported by "serious" initiatives to reform the police or carry out transitional justice.
Interim Prime Minister Hazem El-Beblawi delivered the draft to president Adly Mansour on Sunday, in a further step towards ratifying the controversial law.
The law was approved by the interim cabinet earlier this week. Mansour is expected to review the draft before issuing it through a presidential decree.
A number of political forces and rights groups have also criticised the draft.
"Time will not go back to the era of rulers issuing laws to silence their opponents," the April 6 statement said.
Egypt has seen continuous demonstrations since the January 25 uprising in 2011 which toppled Hosni Mubarak.
Supporters of president Mohamed Morsi – ousted following protests against him in July – continue to take to the streets amid an ongoing crackdown by security forces.