Deviationism
（重定向自Deviationist）
- For the Ffestiniog Railway's use of the word "deviationist", see Ffestiniog Railway#The Llyn Ystradau Deviation.
A deviationist is a person who expresses a deviation: an abnormality or departure. In Stalinism, deviationism is an expressed belief which is not in accordance with official party doctrine for the time and area. Accusations of deviationism often led to purges. Forms of deviationism included revisionism, dogmatism, bourgeois nationalism, and rootless cosmopolitanism.