From the The Detroit News:
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On June 6, 2020, Croft, Fox and about 13 others from several states gathered for a meeting in Dublin, Ohio, near Columbus. Several talked about murdering the “tyrants” or “taking” a sitting governor.
Those present included an FBI confidential source who recorded the meetings. The source has been paid $8,600.
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https://www.detroitnews.com/story/news/local/michigan/2020/10/08/michigan-gov-whitmer-kidnap-livestream/5922742002/
Good link on background:
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https://military.wikia.org/wiki/Michigan_Militia#cite_note-11
“Those present included an FBI confidential source who recorded the meetings.”
Probably organized and led the meeting, too.