Despite this article being 14 years old, it still has relevance.
Some specific areas in which librarians need to be vigilant for covert censorship include:
• Vendor promotional, classification and selection bias
• Use of citation rates in periodical selection and weeding
• The exclusion of independently-published materials
• Pressure from funding bodies
• Self-censorship of librarians
• Adherence to ‘community standards’
• Labelling of controversial items
• Inaccurate or slow cataloguing and classification
• Exclusion of socially unpleasant materials, such as ‘hate items’
Moody, K. (2005). Covert censorship in libraries: A discussion paper. Australian Library Journal, 54(2), 138-147