San Francisco ? A baseball memorabilia collector is parting with the highlights of his Barry Bonds collection, saying the Giants star treated him poorly during a federal investigation into sales of Bonds collectibles.

“I can’t stand the guy,” said Jeff Kranz of Phoenix, who began collecting Bonds baseball cards in 1988. Kranz also said the value of his collection had decreased because of Bonds’ alleged steroid use.

The collection is being auctioned online by Lelands, based in Seaford, N.Y. It includes the jersey Bonds wore when he hit his first home run in the Giants’ current ballpark, a Pittsburgh Pirates uniform he wore in 1992 and a Bonds glove from 1987 backed up by a photo of him signing it.

Kranz is selling his top six Bonds collectibles, which the auction house said could be worth as much as $50,000. Kranz has auctioned other Bonds items recently and sold some items privately to collectors.

Kranz was on a first-name basis with Bonds, often following him to spring-training camp in Arizona and watching him play in different stadiums. That relationship eventually soured.

In 2003, Bonds spotted a fan wearing a jersey bearing his autograph and went to the U.S. attorney’s office in San Francisco, where he filed a complaint about Steve Hoskins, a sports-memorabilia dealer and a Bonds business partner.

Bonds accused Hoskins of forging his signature on at least two endorsement contracts and selling his gear without permission, according to Laura Enos, one of Bonds’ lawyers.

Jeff Kranz holds a baseball glove that was autographed by San Francisco Giants slugger Barry Bonds. A private collector, Kranz is parting with perhaps the country's best collection of Bonds memorabilia.

Hoskins met with federal prosecutors and presented records of all disputed transactions, and the investigation was dropped a year later, according to Michael Cardoza, a lawyer for Hoskins.

Another Bonds’ attorney, Michael Rains, said Hoskins was a witness in a grand jury investigating Bonds for possible tax evasion regarding cash from memorabilia sales he allegedly gave his former girlfriend to buy a house.

Kranz estimates he purchased about 40 percent of his collection from Hoskins. He said authorities confiscated 14 items, and they weren’t returned for two years.

Kranz also said he never heard from Bonds, who claimed he’d help him during the probe.