The Karpis-Barker gang became one of the most formidable criminal gangs of the 1930s. They did not hesitate to kill anyone who got in their way, even innocent bystanders. They robbed a number of banks, hijacked mail deliveries, and soon turned to the lucrative field of kidnapping. In 1933, they kidnapped William Hamm, a millionaire
Minnesota brewer. His ransom netted them $100,000. Shortly after this, they abducted Minnesota banker Edward Bremer, Jr., whose ransom brought them $200,000. The group was led by Alvin, who had a
photographic memory and was described as "super-smart" by fellow gang member
Fred Barker. The other leaders were Doc and Fred, both now out of prison, and the gang included about 25 others. At this time a myth was started that Ma Barker ruled the gang with an iron fist, but the facts do not seem to support these claims. It is highly unlikely that criminals as adept as Karpis, and even Ma's sons for that matter, would have listened to her. Karpis later wrote about this subject in his memoirs:
:"Ma was always somebody in our lives. Love didn't enter into it really. She was somebody we looked after and took with us when we moved city to city, hideout to hideout. It is no insult to Ma's memory that she just didn't have the know-how to direct us on a robbery. It would not have occurred to her to get involved in our business, and we always made it a point of only discussing our scores when Ma wasn't around. We'd leave her at home when we were arranging a job, or we'd send her to a movie. Ma saw a lot of movies."
The kidnappings, however, would lead to the gang's end. The father of the kidnapped Edward Bremer Jr. was a friend of president
Franklin D. Roosevelt. FDR had even mentioned the kidnapping in one of his
fireside chats, and fueled also by the
Lindbergh kidnapping, the FBI and local police bureaus greatly stepped up their pursuit of those engaged in these type of crimes. The FBI had by this time organized a group of highly skilled agents called the "flying squads" who specialized in hunting down the leading public enemies, and much progress was being made. The year 1934 alone saw the deaths of
John Dillinger, Bonnie and Clyde, Charles "Pretty Boy" Floyd, and
George "Baby Face" Nelson.
With these big-name hoodlums out of the way, the FBI stepped up one of the most persistent manhunts of the time for the Karpis-Barker gangmembers. One incident that aided the FBI greatly was when the gang shot and killed one of their own members,
George "Shotgun" Ziegler. Ziegler had been one of the masterminds of the Bremer kidnapping, but after he collected the ransom money, which he kept most of, he began loudly bragging to underworld associates that he was the genius behind the kidnapping. It appeared the one-time hitman for Al Capone, and a lead suspect in the
St. Valentine's Day Massacre, had lost his senses, and the gang knew it couldn't risk having him spill valuable information. On
March 22, 1934, members of the gang shot four slugs into Ziegler as he was coming out of his favorite restaurant in Cicero, Illinois, which nearly decapitated him. The assassins left the corpse, however, and ironically FBI agents found names, aliases, addresses and other valuable information on the gang in Ziegler's pockets. Armed with this information the FBI used it to pick them off one by one, and soon they began getting the big names. Doc was captured on
January 8, 1935, by
Melvin Purvis who, nearly six months earlier, had hunted down John Dillinger. (Sent to Alcatraz, Doc was shot and killed by guards during an attempted escape in 1939.) Just one week later agents tracked down Ma and Fred at a cottage in
Lake Weir, Florida. On
January 16, Ma and Fred were shot to death after a 4-hour gun battle.
Just after Ma and Fred's death, Karpis nearly met his own violent end when the FBI located him in Atlantic City,
New Jersey. Karpis and a couple of other partners managed to shoot their way to an escape, though Karpis's eight-month-pregnant girlfriend Dolores Delaney was shot in the thigh by police. He continued his crimes with others, but had to be on the move more than ever as he was the fourth and last Public Enemy Number 1 left (the previous three having been killed). He did manage to pull off a crime that echoed times of the "Old West", a train robbery in
Garrettsville, Ohio, which netted $27,000. After the death of Ma and Fred, Karpis sent word to J. Edgar Hoover that he intended to kill Hoover the way Hoover had killed Ma and Fred.