Included among the oppressors is the Mubtadi and others who intentionally disseminate anything that contradict Islam – [By Allamah Rabee Ibn Hadi Al-Madkhali]

In The Name of Allah The Beneficent The Most Merciful.

Allah says:

وَلَا تَرْكَنُوا إِلَى الَّذِينَ ظَلَمُوا فَتَمَسَّكُمُ النَّارُ وَمَا لَكُم مِّن دُونِ اللَّهِ مِنْ أَوْلِيَاءَ ثُمَّ لَا تُنصَرُونَ

And incline not toward those who do wrong, lest the Fire should touch you, and you have no protectors other than Allah, nor you would then be helped. (Hud: 113)

Do not incline towards the oppressors—those who oppress the people by (shedding) their blood, (seizing) their wealth, and (violating) their honour, or they oppress people in their religion through Bidah and various forms of misguidance, spreading harmful propaganda and calls (ideas) that contradict Islam. Refrain from inclining towards such people; do not assist them or support their falsehoods. The verse includes all these types (of people).

Every follower  of falsehood is an oppressor, every Mubtadi is an oppressor, and everyone who (violates) a Muslim’s honour is an oppressor. Therefore, do not lean towards any of them, thus you are afflicted by the fire. That is because when you incline towards the sinner, the Mubtadi, the oppressor, the criminal, the one who violates people’s honour and those who violate the sanctity of the Islamic legislation, it is as if you are pleased (with that), as if you are aiding and endorsing. A believer must exercise caution to avoid falling into this perilous inclination. A believer should be careful of this type of inclination, for indeed it is from the causes of deviation and misguidance, and Allah’s refuge is sought.

فَلَمَّا زَاغُوا أَزَاغَ اللَّهُ قُلُوبَهُمْ وَاللَّهُ لَا يَهْدِي الْقَوْمَ الْفَاسِقِينَ 

So when they turned away (from the Path of Allah), Allah turned their hearts away (from the Right Path). And Allah guides not the people who are Fasiqun (rebellious, disobedient to Allah)]. [As-Saff 5] 

An Excerpt from Al-Wasaayaa Al-Manhajiyyah Pg 20.