A shocking video caught four costumed Oktoberfest celebrants repeatedly giving the Nazi salute in an East Germany beer hall this week — sparking an intense police and state investigation. The three men and one woman wearing traditional Bavarian clothing huddled together on Sept. 25 while the Nazi-era marching song “Erika” loudly blares in the background, the footage posted to X, formerly known as Twitter, shows. With a stein in one hand, a leiderhosen-wearing reveler salutes 14 times in the 16-second clip, as his buddy cracks a smile and follows his lead. After displaying the disgraceful symbol for several seconds with...