One of the more controversial subjects to come to light during the NSU murder trial is the level of cooperation and support that neo-Nazi informants and organizations receive from the Federal Office for Protection of the Constitution (BfV), Germany's domestic security agency.
Salah satu topik kontroversial yang diangkat semasa sidang pembunuhan NSU adalah tingkat kerja sama dan dukungan yang diterima informan dan organisasi neo-Nazi dari Dinas Perlindungan Konstitusi Federal (BfV), badan keamanan dalam negeri Jerman.