Moore, who directed the 2007 film SICKO, reacted on his Substack to Mangione allegedly praising him in his manifesto for his examination of the state of the U.S. healthcare system in the film.

Moore investigated the health care industry in his 2007 film Sicko. In Mangione's manifesto, he wrote, "Many have illuminated the corruption and greed (e.g.: Rosenthal, Moore), decades ago and the ...