The leaders said the situation has become unacceptable and poses a direct threat to democracy and the rule of law.
The peaceful march brought together a strong lineup of opposition figures, including Wiper Party leader Kalonzo Musyoka, DCP leader Rigathi Gachagua, PLP leader Martha Karua, DAP-K leader Eugene Wamalwa, former Kakamega senator Cleophas Malala, and Senator Dan Maanzo, among others.
Their joint appearance was meant to send a clear message that the opposition is united and will not be intimidated.
Speaking to supporters and the media, Kalonzo Musyoka said the opposition is deeply worried by repeated incidents where their meetings are disrupted by violent groups, while police officers who should be providing security are accused of standing by or even escorting the attackers.
He said the Constitution guarantees every Kenyan the right to assemble, speak freely, and engage in politics without fear.
Rigathi Gachagua said the opposition has witnessed a worrying trend where police vehicles and officers are allegedly seen in the company of goons before or during opposition events.
According to him, this creates the impression that the police service has taken sides, something that damages public confidence in a critical national institution.
Martha Karua warned that allowing such behavior to continue would take the country backwards.
She said the police must remain neutral at all times and protect all citizens equally, regardless of their political views.
Karua added that when law enforcement appears to work with criminal elements, it erodes trust and fuels anger among the public.
Eugene Wamalwa said the opposition leaders decided to go directly to the Inspector General because the matter is serious and requires urgent attention.
He said Kenya cannot afford a situation where political competition turns violent due to the failure or unwillingness of authorities to act professionally.
The leaders presented a list of demands to Inspector General Douglas Kanja.
These included an immediate and transparent investigation into the allegations, firm disciplinary action against any officers found to have worked with goons, and clear guarantees that opposition meetings will be protected going forward.
Senator Dan Maanzo said the opposition is not looking for special treatment, but fairness. He emphasized that police officers are paid by taxpayers and should serve all Kenyans equally.