Of course, this is a very bad thing. Dangerous even. The government monitors such things. It even claims the authority to seize all the assets owned by such a wayward soul.
Now suppose in its zeal, the government freezes the bank accounts of the entire family, not just those of the foolish child. The family will not be able buy groceries. They will likely be scared and confused. They probably would be angry at their child too.
But suppose in the mean time you feel sorry for the neighbors and bring over a casserole as they try to sort this all out.
Under an Executive Order dated July 17, 2007, all of your own assets may be blocked and seized too.
"all property and interests in property of the following persons, that are in the United States, that hereafter come within the United States, . . . are blocked and may not be transferred, paid, exported, withdrawn, or otherwise dealt in: any person determined by the Secretary of the Treasury, in consultation with the Secretary of State and the Secretary of Defense. . . ."
The persons this applies to are those who have been determined (by the government):
"(ii) to have materially assisted, sponsored, or provided financial, material, logistical, or technical support for, or goods or services in support of, such an act or acts of violence or any person whose property and interests in property are blocked pursuant to this order. . . ."
Of course, good people won't fall under this, right? The government isn't really going to freeze the assets of the neighbors down the street. And if they do, they wouldn't really go after someone who brought them a casserole, right?
Maybe, but the language of the order asserts that very option.
As Han Solo said when things got weird: "I've got a bad feeling about this, Chewey."