The US government claims it has thwarted attempts by militant groups to raise funds using digital currency or cryptocurrency.
The campaigns involved the Hamas military wing, al-Qassam brigades, al-Qaeda and the Islamic State (IS) group.
US officials said around $ 2 million (£ 1.5 million) in cryptocurrency was recovered.
Hundreds of cryptocurrency accounts, four websites and four Facebook accounts were also seized, the Justice Department announced in a statement.
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“These actions represent the largest ever government seizure of cryptocurrency in the context of terrorism,” the department said.
How did the groups get paid?
According to the Justice Department, the al-Qassam Brigades have used social media and its official websites to solicit bitcoin donations.
He said government agents took control of a website to redirect payments to the group, which is the armed wing of the Palestinian militant Islamist organization Hamas. Search warrants were issued against US-based individuals who donated.
Syria-based al-Qaeda militants, meanwhile, have sought donations to purchase weapons via the Telegram messaging app.
The Justice Department said the IS used a website and Facebook pages to sell fake COVID-19 personal protective equipment to raise money.
“Nothing was hidden,” an unnamed US official told Reuters news agency, adding that militant groups “thought they were protected” by encryption in the apps they used.