In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Question: Can we, students of knowledge, remain silent about the Mubtadi’ah (1), educate the seekers of knowledge and the youth on the methodology of the pious predecessors without mentioning the Mubtadi’ah by their names?
Response: By Allaah, they are mentioned by their descriptions, and they are mentioned by their names when the need arises. If so-and-so embarks upon leadership – guiding the Ummah and the youth, and drags them to falsehood, his name is mentioned. If there is a need to mention his name, then his name must be mentioned. It would be suitable (to mention at this point regarding) one of the Salafis in Egypt, who used to teach and in his teaching he used to mention affairs in a general manner, so they (i.e. the students) did not understand; then he began to clearly mention the groups and individuals, so they said, “O Shaikh! Why did you not teach us (like this) from the beginning?” He said, “I used to give you many lessons, and I would tell you this and that”, they said, “By Allaah! We did not understand (i.e. those whom you specifically intended)”.
We studied Kitaab Al Firaq (i.e. book discussing the sects) and memorised it properly, but the contemporary sects were not mentioned. The scholars did not mention At-Tableegh, Al-Ikhwaan and others. (2) We did not consider them to be innovators (in religious affairs) until we became familiar with their condition and studied them, so we thought it necessary to mention them.
All praise be to Allaah, the Shaikhs who used to avoid mentioning them are now clearly mentioning their names (ie. names of deviated groups and individuals). All praise be to Allaah, this is an obligation. If there is no danger, then there is no need to mention the names, (but) if there is danger and they are dragging young people into their midst, rather they are overwhelmed by their trouble, rather they utilise them to wage war against Ahlus Sunnah, then it is obligatory to mention their names – their names are mentioned. They say: “O Ibn Uthaymeen! (Proceed) to the hell fire forever – you and your followers”. This is their view regarding the scholars, they consider them to be unbelievers. These are khawaarij upon the height of harshness. We ask Allaah for wellbeing. [An Excerpt from Kashf As-Sitaar. Pages 30-31. Slightly paraphrased]
 At-Tableegh: https://abukhadeejah.com/mistakes-tablighi-jamaat/ Al-Ikhwaan: http://www.ikhwanis.com/