Of course they are. The Guantanamo recidivism problem has been very real for years at this point, with at least one former Gitmo guest reportedly participating in the September 11, 2012 Benghazi attacks. We also know that of the 'Taliban Five' the Obama White House horse-traded for an alleged deserter, at least one has already made his intentions to rejoin the jihad explicitly clear. Some of the detainees released over the last two administrations genuinely posed little threat, and had been caught up at the wrong place at the wrong time. Many others, however, were dangerous Islamist radicals. It stands to reason, then, that a number of them would inevitably link up with the ISIS death squads. As you read this, keep in mind that these figures are limited to ISIS' Syrian fighting force alone:
As many as 20 to 30 former Guantanamo Bay detainees -- some of whom were released within the last three years -- are suspected by intelligence and Defense officials of having joined forces with the Islamic State and other militant groups inside Syria, Fox News has learned. The development has cemented fears that the U.S. military would once again encounter militants taken off the battlefield. The intelligence offers a mixed picture, and officials say the figures are not exact. But they are certain at least some of the released detainees are fighting with the Islamic State, or ISIS, on the ground inside Syria. Others are believed to be supporting Al Qaeda or the affiliated al-Nusra Front in Syria. A number of former detainees also have chosen to help these groups from outside the country, financing operations and supporting their propaganda campaigns...Of the 620 detainees released from Guantanamo Bay, 180 have returned or are suspected to have returned to the battlefield.
Those who remain at Gitmo are the worst of the worst, which is likely one of the reasons why Congress has repeatedly blocked funding to close the facility and move the detainees onto US soil -- a move overwhelmingly opposed by the American people. The Obama administration, naturally, is working on a scheme to bypass Congress and shutter the place anyway:
The White House is drafting options that would allow President Barack Obama to close the detention facility in Guantanamo Bay, Cuba, by overriding a congressional ban on bringing detainees to the U.S., senior administration officials said. Such a move would be the latest and potentially most dramatic use of executive power by the president in his second term. It would likely provoke a sharp reaction from lawmakers, who have repeatedly barred the transfer of detainees to the U.S...The discussions underscore the president’s determination to follow through on an early campaign promise before he leaves the White House, officials said, despite the formidable domestic and international obstacles in the way. Administration officials say Mr. Obama strongly prefers a legislative solution over going around Congress. At the same time, a senior administration official said Mr. Obama is “unwavering in his commitment” to closing the prison—which currently has 149 inmates detained in connection with the nation’s post-9/11 war on terrorism—and wants to have all potential options available on an issue he sees as part of his legacy.
His preference is to follow the law, you see. But he'll do whatever it takes to get his way. Here's Sen. Kelly Ayotte calling on Obama to suspend all Gitmo detainees, in light of the ISIS revelation. I'm sure he'll get right on that. Be sure to read Allahpundit's post on this, especially the bit about two Al Qaeda leaders we targeted early in our anti-ISIS air campaign in Syria. US intelligence now believes both escaped, and may be "actively plotting" attacks. I'll leave you with a few clips on what ISIS has been up to lately, now that the American public's attention has wandered elsewhere: