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Like a super PAC, which is shorthand for super political action committee, Our Revolution can raise unlimited sums from wealthy patrons that dwarf the limits faced by candidates and conventional PACs. Unlike a super PAC, however, the group doesn’t have to disclose its donors — a stream of revenue commonly referred to as “dark money.”

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Our Revolution has taken in nearly $1 million from donors who gave more than the limits and whose identities it hasn’t fully disclosed, according to tax filings for 2016, 2017 and 2018. Much of it came from those who contributed six-figure sums.

It won’t have to publicly reveal its 2019 fundraising until after this year’s presidential election. And money it raises between now and then won’t have to be disclosed until the following year.