William Harder is known for his controversial collection of items associated with notorious criminals, a hobby often referred to as "murderabilia." His collection includes letters, artwork, and other memorabilia from individuals such as Richard Ramirez, the "Night Stalker," and Charles Manson. Harder has stated that he began his collection after corresponding with Ramirez, leading to a friendship and regular visits to San Quentin State Prison. He has also reached out to other inmates, including Manson, to expand his collection.

In addition to his personal collection, Harder operates a website called MurderAuction.com, where he facilitated the sale of items from incarcerated individuals. This site attracted criticism for potentially enabling criminals to profit from their notoriety. Harder defended the website, describing it as a hobby rather than a business venture.

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