Earlier quoted context omitted.
His core ideas of free software are based on the concept of being free from control over it. The idea is anarchistic since by controlling the software and computing technology one controls society in some way, and the more technology is intertwined with social aspects (which gradually happens the more technology progresses), the higher is that level of control.
As someone else said, Stallman does not identify himself as being an anarchist. If you listen to his talks, he does spend some time on what we need to do to protect ourselves politically and the need to protect democracy. I may be in the minority: I agree with almost everything that Richard says.
Self identification is his personal choice. I'm talking about his ideas however.