The military, the real power behind the civilian government it installed after Mori's ouster in July, remains wildly popular, and many Egyptians, troubled by a stagnant economy, care more for stability than for rowdy protests.
But even supporters of the new government, and secular activists who viewed it as a lesser evil after Morsi's divisive rule, say it has gone too far by banning all but police-sanctioned protests.
Amnesty International reacted on by saying they should never have been arrested and called for their immediate and unconditional release.
It said their imprisonment sends a "strong signal that there will be no limit to the authorities' efforts to crush opposition and that no one is immune to their iron fist."
Applying the new law on Tuesday, police violently dispersed two small protests by secular demonstrators, arresting some of Egypt's most prominent female activists before dumping them on a desert road at night.
Prosecutors have ordered the arrest of two leading secular activists and dissidents under Morsi -- Alaa Abdel Fattah and Ahmed Maher -- for allegedly inciting the protests.
"Deja vu, I'm about to hand myself in to the authorities again on Saturday," Abdel Fattah wrote on Facebook, but he never got the chance to do so.
His wife wrote on Twitter that security services arrested him at their home in western Cairo yesterday and had beaten her during the process.
In the months since the army removed Morsi, more than 1,000 of his supporters have been killed in a police crackdown, and thousands arrested.
