“Salah Gosh was the main criminal in the regime,” Nahid Gabralla, a Sudanese human rights activist, said in a phone interview on Saturday. But Ms. Gabralla did not view his resignation as much of a victory for the protesters. The senior security officials in Mr. al-Bashir’s government, for the most part, remained.
“The regime is still in control,” she said.
Ms. Gabralla also said there was no indication that Mr. Gosh would be held accountable for the intelligence service’s brutality and abuses.
“He is being given a chance to escape justice,” she said.
His abrupt departure, less than 24 hours after the interim military chief stepped down, bolstered speculation that a power struggle was underway inside the clique of powerful security chiefs who once pledged loyalty to Mr. al-Bashir.
Over his 30-year rule, Mr. al-Bashir spread power among a range of military commanders, paramilitary outfits and ethnic factions, often using them to carry out campaigns like the notorious counterinsurgency in Darfur and southern Sudan.
When the protests swelled in recent weeks, Sudan experts had warned of a destabilizing battle for supremacy between the commanders of those groups should Mr. al-Bashir be removed.
One significant figure is Lt. Gen. Mohammed Hamdan, widely known as Hemeti, who commands the Rapid Support Forces, a paramilitary group that evolved from the Janjaweed militia that operated in Darfur.
Mr. Gosh led the intelligence service for much of the 2000s, during which time he cooperated closely with the C.I.A. in hunting Al Qaeda members.