Who organized the “No Kings” protests?

The “No Kings” protests were largely organized by liberal U.S. groups including the 50501 Movement, Indivisible, and MoveOn. The nonpartisan American Civil Liberties Union, or ACLU, also helped facilitate rallies. The 50501 Movement coined the name “No Kings.” On its website, the group promotes the “3.5% rule,” the idea that significant political change may happen if 3.5 percent of a population joins a movement.