Short answers, pulled from the story.
ProVeg Deutschland traces its origins to 1867 when Eduard Baltzer established the German Association for a Natural Lifestyle in Nordhausen. The modern organization emerged from a merger of two major groups in Leipzig on June 1932, though it officially adopted the name ProVeg Deutschland following an assembly on the 22nd of April 2017.
The Nazi regime forced the association to dissolve itself on the 18th of February 1935 under accusations of promoting pacifism. Member magazines ceased publication entirely after 1933 due to these restrictions, and a conference held in Oranienburg in 1932 had been one of the last gatherings before this political pressure intensified.
As of 2015, the organization held 14,000 members making it the largest group of meat-free living people in the German-speaking world. Numbers remained stable around 14,000 through 2017 despite earlier rapid expansion phases that saw membership climb to 10,000 by 2013.
The headquarters remains located in Berlin today. The organization joined the international umbrella ProVeg International after its name change was approved at an extraordinary member assembly in Berlin on the 22nd of April 2017.
ProVeg Deutschland runs the Thursday is Veggieday campaign which promotes vegetarian food in restaurants and canteen catering across the country. The organization also organizes participation in the Worldwide Vegan Bake Sale every year alongside meatout campaign days and produces Veggie Times newspapers for beginners seeking plant-based lifestyle tips.