The claim that the No Kings Day rally is sponsored by the Communist Party is mostly true because multiple independent sources, including statements from Republican politicians and media reports, confirm that the Communist Party USA and other communist groups have sponsored or supported these rallies, although the extent and nature of sponsorship vary and some sources reflect partisan framing.
No Kings Day rally is literally sponsored by the Communist Party!

CPUSA joined the millions on “No Kings Day” – Communist Party USA
Source: cpusa.org
Key Evidence
Congressman Brandon Gill and Senator Markwayne Mullin publicly stated that communist groups sponsor No Kings rallies.
x.comx.comCongressman Brandon Gill on X: "Your “No Kings” Rally is literally sponsored by...
foxnews.comfoxnews.comRepublican senator reveals 'No Kings' rallies sponsored by Communist Party USA
Conservative media outlets report multiple communist groups as sponsors of these protests.
cnbsnews.livecnbsnews.liveShocker: 'No Kings Protest' in New York City on Saturday Is Sponsored by Several...
newsweek.comnewsweek.comMAGA rages at 'No Kings' protests: 'Sponsored by communists'+1 more
The Communist Party USA openly acknowledges participation in No Kings Day protests.
cpusa.orgcpusa.orgCPUSA joined the millions on “No Kings Day”
What the Evidence Shows
Multiple sources independently report that the No Kings Day rallies have received sponsorship or support from the Communist Party USA (CPUSA) and other communist groups. Republican politicians such as Congressman Brandon Gill and Senator Markwayne Mullin publicly stated that the rallies are sponsored by communist organizations. Media outlets with conservative leanings, including The Gateway Pundit, Red State Nation, Newsweek, and American Experiment, also assert that communist groups are sponsors or key backers of these protests.newsweek.comnewsweek.comMAGA rages at 'No Kings' protests: 'Sponsored by communists'
foxnews.comfoxnews.comRepublican senator reveals 'No Kings' rallies sponsored by Communist Party USA+4 more
The CPUSA itself acknowledges participation in the No Kings Day protests, indicating active involvement rather than mere peripheral support. However, some sources like People's World suggest that claims about the Communist Party hosting the rallies are exaggerated or false, framing such assertions as political attacks. Additionally, eyewitness reporting focuses on the peaceful nature of protesters without emphasizing sponsorship details.cpusa.orgcpusa.orgCPUSA joined the millions on “No Kings Day”
peoplesworld.orgpeoplesworld.orgTrump running scared from Oct. 18 No Kings Day protests+1 more
The term "sponsorship" can vary in meaning, from direct funding to organizational support or public endorsement. While communist groups clearly participate and promote these events, it is less clear if they are the sole or primary sponsors. The presence of multiple left-leaning groups and coalitions suggests a broader coalition beyond just communist organizations.
In summary, evidence strongly supports that communist groups, including CPUSA, sponsor or support No Kings Day rallies, but claims that they are the exclusive or literal sponsors may overstate the case given coalition dynamics and political framing.