ODM has held the police responsible for the chaos that has marred its primaries.
They accuse security agencies of colluding with Jubilee Party to discredit the process.
Police had assured all political parties of tight security as primaries reach their penultimate week.
Spokesperson George Kinoti also warned aspirants and supporters against making inflammatory remarks will face the law.
"This will not be tolerated and officers are under instruction to deal firmly with anyone found breaching the law," he said in a statement to newsrooms on Thursday.
More on this: Police assure tight security as party primaries close
But ODM secretary general Agnes said the police have been slow to take action against perpetrators of violence in ODM areas but quick to act when it comes to JP zones.
"The national police service is only providing security in Jubilee areas. The presence of the police appears to be cosmetic in ODM zones."
The Orange party staggered its nominations which are scheduled to end on April 25.
She cited the violent incident in Migori county on Thursday where a group of youth attacked and injured county election officials.
The group was holding a meeting with election clerks and returning officers at Rakwaro Primary School when the incident happened.
Zani told the press at Orange House on Friday that despite the culprits being captured on camera, no arrests have been made 24 hours later.
"Thugs are being let to run amok and to rule areas like Migori with reckless abandon."
"We demand equal treatment like in Jubilee areas where the police ensured law and order is maintained during the primaries," she said.
Zani claimed that thugs have been hired and are enjoying police protection to disrupt ODM primaries and portray the party as violent.
"We believe the police are deliberately ignoring the ODM areas so that chaos can break out so that ODM is labeled as violent and chaotic."
"If what happened in Migori was in Murang’a, the police cells would be full."
Last week, the ODM disciplinary committee fined Migori Governor Okoth Obado Sh2 million.
This was after his supporters disrupted a meeting convened by Suna East MP Junet Mohamed.
"We hold the police responsible for all the violence that occur in those areas as they have refused to take action," she said.
She warned politicians who are hell-bent on causing chaos that the party will not condone the behaviour.
President Uhuru Kenyatta ordered the police to arrest and punish culprits of poll violence.
He said disruptions of poll activities will not be entertained.
Thank you for participating in discussions on The Star, Kenya. Note that:
- Unwarranted personal abuse and defamatory statements will be deleted.
- Strong personal criticism is acceptable if justified by facts and arguments.
- Deviation from points of discussion may lead to deletion of comments.