Peter Sager (17 January 1925 – 1 July 2006) was a Swiss political scientist and economist, an expert in Eastern European affairs, as well as a right-leaning conservative and later libertarian politician (BGB, SVP, LPS).

After that, Sager visited the Soviet Union Program at Harvard University for two years where Alexander Gerschenkron, Merle Fainsod, Zbigniew Brzezinski, Robert Lee Wolff and Isaiah Berlin were teaching.

Influenced by the events of the Hungarian Revolution of 1956, he came back to Switzerland prematurely to build a political information centre for the research of communism.

[7] Sager's original intent was a scientific career, but after the Hungarian uprising he more and more contributed to establishing the Swiss Eastern Institute.

[8] Sager was committed to anti-communism and used to polemise against movements like the Swiss New Left, which earned him a reputation of "the Cold War in person".

"[10] Apart from establishing the Library of Eastern Europe since the late 1940s, Sager in the 1950s also began to collect historical western European prints and maps of Russia.

In 1945, Peter Sager joined the Party of Farmers, Traders and Independents (German: Bauern-, Gewerbe- und Bürgerpartei, BGB) where his father had already been active.

"[18] In the late 1980s, Sager began to oppose SVP politician Christoph Blocher whom he called "a horrible catastrophe" in a 2005 interview.

"[9] In contrast to Blocher, Sager was an advocate of Switzerland joining the United Nations in 1986 and the European Economic Area (EEA) in 1992.

[23] Sager replied with an essay "Fallstudie einer Diffamierung – Nachrichtenmanipulation durch Nicaragua-Propagandisten in der Schweiz" [Case Study of a Defamation – Manipulation of the News by Nicaragua Propagandists in Switzerland][16] and with filing lawsuits for libel.