Unlike U.S. political campaign committees, which are regulated by the Federal Election Commission, 501(c)(4) organizations can accept donations from foreign countries. It appears from its website that Onward Together will accept money from anywhere, from Afghanistan to Zimbabwe, and even from the Russian Federation. The site states that individuals who contribute must be U.S. citizens or “lawfully admitted” permanent residents, but it doesn’t mention any limitation on contributions from foreign governments, companies or organizations.
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Unlike a political campaign committee, a 501(c)(4) is not required to make its donors public.
Hypothetically, a foreign government could donate to a politically oriented 501(c)(4) and finance a campaign of marches, protests and resistance designed to sow dissension in the United States and even undermine the U.S. government from abroad.
A 501(c)(4) organization can also make donations to a SuperPAC, which can spend money on campaigns. The SuperPAC must disclose the donation but not the names of the donors behind it. They stay secret. Coincidentally, there’s also an Onward Together PAC.