Both Mayes and Grosskurtz have a connection through the 'Peoples Revolution':
"Vaun Mayes, a BLM leader who has shown up at Peoples Revolution protests, is facing federal charges in an alleged molotov cocktail plot to burn down a police station; court records say prosecutors allege he abused his mentoring responsibilities to children by allegedly “encouraging them to attack police and teaching them how to make Molotov cocktails.”
https://www.wisconsinrightnow.com/2020/12/15/milwaukee-county-board-blm
"Grosskreutz admitted upon further questioning that he spoke at a rally hosted by the Peoples Revolution, a Milwaukee-based group that has protested against police violence."
https://www.theblaze.com/news/gaige-grosskreutz-kyle-rittenhouse-pointed-gun-at-defendant