(CNN) A group of Iranians was released from U.S. prisons on Sunday as part of a swap with the Middle Eastern nation, with President Barack Obama describing the move as a "one-time gesture."
Like the Americans who've now been freed from prison in Iran, secret negotiations won them freedom, and some of them had spent years behind bars. But the cases of these seven men, six of whom also are U.S. citizens, haven't gotten as much attention.
The men allegedly had been involved in exporting products and services to Iran in violation of trade sanctions against the country. They were accused of exporting goods ranging from electronic components and satellite services to marine navigation and military equipment. Some of them had been convicted. Others were awaiting trial.
Here's what we know about the seven Iranians charged in the United States who were part of the deal:
Afghahi, 72, was arrested in California in April and faced charges for allegedly violating the Iranian embargo and money laundering.
He was the managing director and part owner of Tehran-based Faratel Corporation and the minority owner of Houston-based Smart Power Systems, according to a grand jury indictment filed in federal court in Texas in April.
He was accused of participating in a scheme to illegally export high-tech microelectronics as part of an "Iranian procurement network operating in the United States," the Justice Department said after his arrest.
He had pleaded not guilty and the case had not yet gone to trial, attorney David Gerger said. A pardon was handed to him at 4:30 a.m. Sunday, allowing him to be released from prison after nine months behind bars, according to his attorney.
Gerger described his release as "the right result," adding that his client is now spending time with his family.
"He is a good man," Gerger said, "and we are glad to put this behind him."
U.S. companies violated Iran sanctions, indictment says
Faridi, of Houston, was vice president of Smart Power Systems and was accused of participating in the alleged scheme. In a statement released at the time of the indictment, an FBI official said such microelectronics shipments could put national security at risk.
"The proliferation of sensitive U.S. technologies to Iran and the direct support to their military and weapons programs remains a clear threat to U.S. national security," said Randall Coleman, assistant director of the FBI's counterintelligence division.
Faridi's attorney told CNN affiliate KPRC that his client never posed a threat to the country.
"He's as American as anybody that was born in this country. He's loved being here, he's fought hard to be here and he's going to stay here, so it's been very stressful to him to be accused of being somebody who's a threat to national security when he's just as American and patriotic as anybody in this town," attorney Kent Schaffer said.
He faced charges for allegedly violating the Iranian embargo and money laundering. The case had not yet gone to trial. He was pardoned on Sunday as part of the deal.
Mechanic, the majority owner of Faratel and Smart Power Systems, also was accused in the same alleged scheme. He faced charges of violating the embargo and money laundering, among other counts.
Attorney Joel Androphy told CNN that Mechanic, Faridi and Afghahi were met by their wives after their release and headed to their homes.
"They were ecstatic to be out," he said.
The attorney told KPRC that his client eventually plans to return to Iran.
Androphy told Forbes the accusations against his client were baseless and he believes they would have won if the case had gone to trial.
Mechanic was pardoned on Sunday as part of the deal.
The 30-year-old Iranian national pleaded guilty in December to charges of wire fraud and unauthorized access to computers, the Department of Justice said.
He was arrested in Turkey in November 2013 and extradited to the United States last February.
According to a plea agreement, he conspired to hack the network and computers at Arrow Tech, an engineering consulting and software company in Vermont.
His lawyer did not immediately respond to a request for comment.
The naturalized U.S. citizen, who lived in Potomac, Maryland, was convicted in 2013 of conspiring to illegally provide satellite services to Iran, federal officials said at the time.
He was a mechanical engineer with science and engineering degrees from George Washington University. Prosecutors argued he'd broken the law by helping Iran launch communications satellites.
He was sentenced to eight years in prison in 2013. That sentence was commuted as part of the deal.
His lawyer did not immediately respond to a request for comment.
A naturalized U.S. citizen, Ghahreman was convicted in April of violating U.S. export and money laundering laws as part of a scheme to buy marine navigation equipment and military electronic equipment for illegal export to Iran.
He was sentenced to six-and-a-half years in prison last August. That sentence was commuted Sunday as part of the deal.
Attorney Ellis Johnson said Ghahreman and his family were extremely relieved after his release.
"He plans to spend some time with his aunt and her family on the East Coast, reunite with his girlfriend who's currently on the West Coast, and hopefully visit his elderly parents in Iran, whom he hasn't seen in years since this case began," Johnson said.
Ghahreman, the attorney said, is a "kind, considerate man who poses no threat to the United States."
A federal jury in convicted Saboonchi, who holds both Iranian and U.S. citizenship, in August 2014 of conspiracy and seven counts of exporting American manufactured industrial products to Iran.
He was sentenced to 24 months in prison last February. That sentence was commuted Sunday as part of the deal.
In a written statement, his attorneys described Saboonchi as a "hard-working family man and American" who poses no danger and "has a bright future ahead."
"He was born in the U..S and is proud to be raising his young family here. His arrest and incarceration were devastating to his many friends and family," attorneys Elizabeth Oyer, Lucius Outlaw III and Meghan Skelton said. "Ali is thrilled and grateful for his release and return to his family."