The SVP is well known and has often been criticzed for its racist propaganda that has very close resemblance to the nazi propaganda posters of the 1930s (red rats vs Jewish and communist rats, the use of animals like crows, rats, ……). No other Swiss party invests that much money into their political propaganda.
Probably the most famous case is the propaganda poster about white sheeps kicking a black sheep out of the country. The SVP spent millions to have it prominently displayed in all Swiss cities. It has been copied by neo nazi and far-right parties across Europe, including the German NPD, Lega Nord, Vlaams Belang and Front National. Other parties that have copied SVP posters include the BNP.
Historians like Lang have commented on the close resemblance of nazi and SVP propaganda images.
The NPD is even distributing NPD postcards that potray Switzerland as a shining example and role model for Germany because of the successes of the SVP.