The law has become a popular tool for prosecutors, who have prosecuted some 150 people under the statute in the United States, obtaining convictions in around 60 cases, and sentences ranging up to life in prison.
The Associated Press adds,
In his dissent, Breyer recognized the importance of denying money and other resources to terror groups. "I do not dispute the importance of this interest," he said. "But I do dispute whether the interest can justify the statute's criminal prohibition."
Breyer said the aid groups' mission is entirely peaceful and consists only of political speech, including how to petition the U.N.
"Not even the 'serious and deadly problem' of international terrorism can require automatic forfeiture of First Amendment rights," he said.