Read on Twitter
Sign appears to reference "RevCom", that's short for Revolutionary Communist Party, founded by Bob Avakian, and better known by their front group, "Refuse Fascism" https://twitter.com/VenturaReport/status/1299174027009941505?s=20
The Revolutionary Communist Party has repeatedly been known to play a role in fomenting and exacerbating violent riots, as they did in the Ferguson Riots and the Rodney King Riots.
As @Project_Veritas noted in their undercover reporting on Antifa, RCP front Refuse Fascism has received funds from Soros' Open Society and was apparently in talks to get funding from Democratic candidate for president Tom Steyer. https://www.projectveritas.com/news/refusefascism-uses-antifa-like-tactics-organizer-claims-they-received-money/
Refuse Fascism's fiscal sponsor is a group known as the Alliance for Global Justice (AGJ), an Arizona-based group which was formed out of something called the Nicaragua Network which was created to support the Communist Sandinista government.
As @capitalresearch has pointed out, AGJ was also fiscal sponsor for the Movement for Black Lives (MBL), one of the major BLM movement organizations, and in fact was fiscal sponsor for over a 100 radical left organizations. https://capitalresearch.org/article/communists-funding-the-resistance-the-alliance-for-global-justice/
On their website Alliance for Global Justice admits they were founded to support "an armed revolution", meaning in Nicaragua.
Legislators should look closely at the "Fiscal sponsorship" loophole. While I understand the difficult of setting up legitimate non-profits- this method is being used for what some might say is essentially money-laundering for insurrectionist causes.
