I don't know which case you're thinking of but generally the trend seems to be police officers leaking data about (perceived) left-wing activists to far-right groups.
There is a known far-right extremism problem in the German police force and military, e.g. the founder of GSG9 (think German SWAT) and a brigadier general and former commander of the KSK (think German SOCOM/SEAL) published a book with a far-right publishing house, which was the first in a series of incidents that led to the KSK being reformed in 2020 to (hopefully) address the systemic far-right extremism problem.
There have been credible claims of ties of far-right terrorist groups like Combat 18 and NSU 2.0 to the police. E.g. in one of the biggest news stories there was a find of not only a disturbing cache of weapons and body bags but also "kill lists" found to be sourced from police computers.
There are obvious ideological reasons why police officers are more likely to be supportive of far-right extremism than, say, far-left extremism. That isn't to say police officers are generally far-right but maintaining the status quo, opposing disturbances of the public order and enforcing the letter of the law fit better with conservatism than progressivism and social justice movements, let alone radical leftism.
There is a known far-right extremism problem in the German police force and military, e.g. the founder of GSG9 (think German SWAT) and a brigadier general and former commander of the KSK (think German SOCOM/SEAL) published a book with a far-right publishing house, which was the first in a series of incidents that led to the KSK being reformed in 2020 to (hopefully) address the systemic far-right extremism problem.
There have been credible claims of ties of far-right terrorist groups like Combat 18 and NSU 2.0 to the police. E.g. in one of the biggest news stories there was a find of not only a disturbing cache of weapons and body bags but also "kill lists" found to be sourced from police computers.
There are obvious ideological reasons why police officers are more likely to be supportive of far-right extremism than, say, far-left extremism. That isn't to say police officers are generally far-right but maintaining the status quo, opposing disturbances of the public order and enforcing the letter of the law fit better with conservatism than progressivism and social justice movements, let alone radical leftism.