Search statements:
censorship AND histor*
censorship AND legislation
censorship AND "freedom of speech"
censorship AND law
Scholarly journal:
Azhgikhina, N.. "Censorship in Russia: Old and New Faces. " World Literature Today 85.6 (2011): 34-39. Research Library, ProQuest. Web. 27 May. 2012.
After searching "censorship and 'free speech'" I came across this article and it serves as a good example of historical and modern censorship. The in-depth article was written by a journalist and published in the journal World Literature Today.
Magazine:
Sirico, Robert A. (1996, July). Don't censor the Internet. Forbes, 158(3), 48. Retrieved May 27, 2012, from Research Library. (Document ID: 9862827).
I found this article after searching censorship AND legislation. It is useful because it is a recent example of censorship that is still an issue today.
Newspaper:
BILL KELLER, Special to The New York Times. "A Proposed Soviet Law Limits Press Censorship. " New York Times 27 Sep. 1989, Late Edition (East Coast): ProQuest National Newspapers Core, ProQuest. Web. 27 May. 2012.
This article is useful since it explains several examples of censorship in Soviet Russia over its history. It also explains how the laws were changed to allow some dissent.
My original search term brought limited results so I broadened my search to "censorship" and go too many hits. A suggestion said Censorship AND "freedom of speech" so I clicked that, and got some results. I then changed the last part to "legislation" and then "law". All latter results had plenty of journals, newspapers, and magazines to sort through.