“[The official] had publicly made a call for the killing of the Numsa general secretary,” spokesman Castro Ngobese said in a statement.
“We hope that the investigation by the SA Police Service will unearth the underlying reasons or circumstances that led [him] to call for the killing of our general secretary.”
The case was opened at the Sandton, Johannesburg, police station against the official, who is the Police and Prisons Civil Rights Union’s (Popcru) Gauteng secretary and an SA Communist Party provincial executive committee member.
On Tuesday, the National Union of Metalworkers of SA (Numsa) showed reporters a post on Facebook by a person it claimed was a Popcru office bearer in Gauteng.
Numsa deputy general secretary Karl Cloete said the post contained a public threat to kill Jim.
The post read: “All of u can write what u like and say all manner of things, it will never deter us from our strategic alliance with the ANC, I’m saying it now that Irvin Jim is the most vitriolic political amoeba and must be expelled within our ranks.
“Thugs and criminals must be out rooted from society even if it means it’s yourselves who are chatting here we must deal with u to the extent of killing you if u pose threat to life, no apology.”
On Wednesday, Popcru distanced itself from the comments made by its member on Facebook.
“We want to place on record that comments or status updates made by individuals on social media, despite their affiliation to Popcru, do not represent the organisation’s stance,” the union said in a statement.
“We have no ill intentions or wishes towards the Numsa general secretary.”