Class action lawyer Howard Foster, who has had considerable success suing the employers of illegal immigrants,  has a blog about refugee policy, to which I've added some links:

"It would come as unwelcome news to the vast majority of Americans that even now, in the worst economic downturn since the Great Depression, and a decade after 9/11, that this country admits upwards of 80,000 refugees each year on little more than the recommendation of a foreign organization and once here compete for low-paying jobs with our high-school graduates. But that is the essence of our refugee system. Refugees are persons who have fled their home countries due to fear of persecution on account of their race, religion, nationality or membership ”in a particular social group.” 8 U.S.C. sec. 1101(42)(part of the Immigration and Nationality Act). There are many refugees in the world, and the U.S. is a caring country. After World War II the U.S. signed on to the United Nations Protocol Relating to the Status of Refugees.

Basically this means we must cooperate with the International Organization for Migration (IOM), an arm of the U.N. and other NGO’s which house refugees in camps throughout the world and try to resettle them.

The IOM first tries to resettle refugees in a third country, such as where refugee camps are located or where the refugees have relatives who will sponsor them. But when those options are not possible, the IOM places the refugees with countries which have signed on to the U.N. Protocol, meaning some come here.

The recent indictment of Mohamud Adbi Yusuf, a refugee from Somalia who allegedly conspired with other Somalis throughout the U.S. to transmit money to Al-Shabaab, a foreign terrorist organization, raises very troubling questions. What background checks are conducted before refugees are admitted to the U.S.? Who conducts the checks, the IOM or the U.S. government? What happens to refugees after they are ”paroled” (admitted) into the U.S.? I’ve spent days researching these questions, and the answers are completely unsatisfactory.

OUR ”REFUGEE” POLICY IS A DISASTER | Foster PC - A RICO Law Firm

Regarding the indictment of Mohamud Adbi Yusuf, US Attorney Richard Callahan's statement about it said

"This type of activity is uncharacteristic of the local Somalian population in the St. Louis area, which is approximately 2,000."

How does he know that? Somali is a country without a government—their system of customary law means that they have little concept of, and no respect for, American law, especially as it relates to international money transfers.

Their religion is Sunni Muslim, and there have been many cases of refugees going back to Somalia to fight on the side of Shariah. One of them, Shirwa Ahmed, committed a suicide bombing in Mogadishu.

So, I repeat, why does US Attorney Callahan think that Somali support for terrorism is "uncharacteristic" of the Somali population of St. Louis? I would have thought it was very characteristic.

I suggest you read the rest of Howard Foster's article—what I've posted above is only an excerpt.