Вандал
A vandal is someone reducing the generally perceived quality of articles, usually for fun, or inserting outright nonsense into discussions, erasing articles wholesale, or otherwise disrespecting more effective contributors . This sparks the Wikipedia Vicious Cycle which drives those contributors out.
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Trolls may or may not qualify as vandals. Some think they are social vandals. These tend to be the same people that believe that a Wikimedia wiki is a sort of community .
Wiki Spammers are a type of vandal who add unwanted external links to wiki articles in order to promote their websites (or their customer's websites) in search engine rankings. MediaWiki has some Anti-spam Features. In particular, most new MediaWiki installations use the 'rel=nofollow' attribute on all external links, meaning that spamming those wikis is a completely pointless thing to do!