The groups and individuals profiled in this section openly advance radical agendas and worldviews. In some cases, they report the news from an overtly Marxist or socialist perspective; others conceive their role as a “political organizing tool” for the left. An outstanding overview of the leftist media is provided in the article "Inside the Disinformation Machine: A Look at the Left's New Media Operation," authored by Matthew Sheffield and Noel Sheppard and published by the Capital Research Center in September 2008.