Roberson remains in jail and declined to speak with The Associated Press. Her attorney, Raymond Kimble, said he had just been assigned to her case and was not yet able to comment.

Roberson pleaded not guilty to one count each of armed robbery, attempted armed robbery and attempted aggravated robbery. She is scheduled for an initial pretrial conference on July 30. If convicted, she faces between seven and 39 years in prison. Her kids and their friends were also arrested.

Police are calling the allegations against Roberson "revolting," but they pale in comparison to what the Barker boys did when they became adults.

By the 1920s, the Barker boy crimes escalated from robbing empty stores to kidnapping rich people and holding them for ransom, killing anyone who crossed them, and robbing banks crowded with people at gunpoint, Koblas said.

They even made women stand on the running boards of their getaway car so police wouldn't shoot at them.

"They killed someone almost every time they went out," Koblas said. "They thought nothing of taking human life."

Three of Barker's boys eventually went their own way, each living a life of crime. Freddie traveled with his mother across the Midwest and committed crimes with a man named Alvin Karpis, whom Freddie had met in prison.

Eventually, authorities caught up with the entire so-called Barker-Karpis gang.

Herman, the oldest, killed himself after being wounded during a shootout with police. The next oldest, Lloyd, was shot and killed by his ex-wife soon after he was released from serving a 25-year prison sentence. Arthur, or "Doc," was shot and killed by prison guards when he tried to escape from Alcatraz.

FBI agents tracked Freddie and Ma Barker to a cottage in Lake Weir, Fla. in 1935, the only known instance that Barker herself carried a machine gun. Barker and Freddie were killed during an hours-long shootout with the feds.

Karpis was arrested the following year and imprisoned until 1969. He later wrote an autobiography, then moved to Spain, where he died from natural causes in 1979.

Phoenix police believe Roberson and the youngsters committed at least 20 robberies involving assaults on victims between the age of 13 and 20. One 13-year-old was beaten and forced to empty his pockets — which contained only a lollipop. One victim suffered a concussion.

Roberts said the group's downfall came after one of the boys spotted someone he had robbed the day before at a grocery store, went up to him and said: "I remember you — you're the guy I punched in the face yesterday."

On May 29, Phoenix detectives were about to serve a search warrant at Roberson's apartment when she and some of the boys got in the SUV and left.

Police pulled the group over and arrested them; Roberts said detectives believe the group was on the way to commit a robbery.

Police believe that if Roberson and the others hadn't been caught when they were, their crimes could eventually have become much more serious.

"What I see is when people start off doing small crimes, and they become successful at those crimes — especially when they're violent crimes — the violence seems to escalate," Roberts said.