フランツ・ヨーゼフ・シュトラウス
The differences between the CDU and the somewhat more socially conservative CSU have sometimes led to conflicts in the past. These tensions climaxed during the 1970s when Helmut Kohl became CDU chairman in 1973, then considered a moderate or even progressive politician and also a personal foe of the right-wing then-CSU chairman Franz Josef Strauss, who had held that office since 1961.