Purity test (politics)

In politics, a purity test is a rigid standard on a specific issue by which a politician or other figure compared. Purity tests are established to ensure that the subject maintains ideological purity with the ideas supported by a particular group, often a political party or one specific faction of a party. Purity tests are often used in the form of strict in-group and out-group boundaries, where failure of purity tests indicates membership of an out-group. When used in this fashion, purity tests are a form of no true Scotsman fallacy. Purity tests are similar to the concept of litmus tests that are used in political nominations and appointments. rdf:langString