Gordon Welters for The New York Times
BERLIN — A criminal investigation into an artist who built a partial replica of Germany’s national Holocaust memorial next to the home of a far-right politician has been formally closed, more than 16 months after it began but less than a week after its existence became public.
But reverberations from the inquiry into the artist, Philipp Ruch, and his collective, the Center for Political Beauty, have continued to spread. On Thursday, a letter was released from more than 100 prominent German cultural figures, academics and politicians expressing “disbelief” at the investigation, which employed a legal provision more often used to monitor gangs, extremist groups and terrorist cells.
The letter demands an apology and an explanation from those who undertook the investigation, and calls on them to disclose any political links: Martin Zschächner, an attorney for the state of Thuringia who was in charge of the case, has been accused by the left-wing politician who uncovered the inquiry of being soft on far-right offenders.
The outcry has come after a public discussion about right-wing activists in positions of public authority, and after several publicized cases of extremists among police and army officers.
The weekly newspaper Die Zeit has reported that during the course of the investigation, Mr. Zschächner donated 30 euros, about $34, to Alternative for Germany, the far-right party represented in Thuringia’s State Assembly by Björn Höcke, the target of Mr. Ruch’s artwork.
On Monday, when the investigation was formally closed, Mr. Zschächner was taken off the portfolio of state security and…