The court ruling against Hawks head Berning Ntlemeza supports the principle that state administration should be rational and within the confines of the law, Freedom Under Law and the Helen Suzman Foundation said on Thursday.
"In this exceptional case, the court found that the applicant had shown that were Major-General Ntlemeza to remain in office, the public would suffer irreparable harm," the organisations said in a joint statement.
The High Court in Pretoria on Wednesday denied Ntlemeza leave to appeal a previous judgment declaring his appointment unlawful and invalid and setting it aside. The court ordered him to vacate his office immediately.
On March 17, the same court found that former police minister Nathi Nhleko had ignored two court judgments which found that Ntlemeza lacked "integrity and honour" when he appointed him head of the elite police unit.
Police Minister Fikile Mbalula on Wednesday said he had withdrawn the ministry's application to appeal the March judgment.
He is expected to brief the media on his decision on Thursday.