In the 1970s he served as a secretary of the Neutral Nations Supervisory Commission in Panmunjom, Korea with the rank of a Swiss army captain; he traveled extensively in East Asia and Eastern Europe.
In the 1980s he created a pressure group under the name "Buergeraktion" (People's Action) and aggressively supported candidates of Switzerland's center-right majority parties.
Dreher countered the rise of the Green Party of Switzerland and particularly rebuked its claims about Forest dieback which he denounced as the "lie of the century".
His verbal attacks on the "reds and greens" were often rude, and rocked the political establishment of Switzerland.
He was a member of Scaphusia Schaffhausen and an admirer of US President Ronald Reagan and UK Prime Minister Margaret Thatcher.