MINNEAPOLIS — A St. Paul man acted as a gun dealer when he bought and sold dozens of guns online for profit, and did not obtain a proper license or conduct required background checks on his buyers — despite a warning from federal agents, according to court documents unsealed Thursday.

Some of the guns sold by Eitan Benjamin Feldman were used in area crimes within days of their purchase, authorities said.

Feldman, 29, was indicted Thursday on one count of willfully dealing firearms without a license and nine counts of making a false statement during a firearm purchase. He was arrested Thursday, and it was not immediately clear if he had an attorney to comment on his behalf.

Authorities say Feldman portrayed himself as a gun collector, but was instead a gun dealer who sold the weapons to make a living and lied in order to circumvent the law. Federal law requires that firearms dealers be licensed, and that they conduct background checks on buyers. Gun collectors are encouraged to also conduct background checks, but are not subject to the same requirements.

“Mr. Feldman is alleged to have used this exception in violation of the law to get around background checks and endanger all of us,” U.S. Attorney Andy Luger said. “Collectors, gun owners, innocent citizens — all should be outraged by his behavior because it puts everyone at risk.”

According to the indictment, since January 2014, Feldman regularly bought guns from out-of-state online dealers or auctions and resold them to make money.