Reverse Domain Hijacking
Reverse domain name hijacking is the term used for when an individual or (more commonly) an organization abuses the legal system in order to take ownership of a domain name from another registrant.
Among other possible scenarios, they will file a UDRP complaint in the hopes of gaining ownership of the domain either by having a UDRP panel that is sympathetic to their claims, or by scaring the defendant into submission, or by finding a defendant that is unwilling or unable to pay the legal fees.