Liberal MP Bernie Finn wants Victoria Police investigated, saying they didn't do enough to stop violence at a rally when pro-choice protesters clashed with an anti-abortion march.

Mr Finn, an organiser of the annual March for Babies, says police did nothing to quell the violence as about 50 protesters attempted to disrupt the anti-abortion event in Melbourne on Saturday.

He said he will be asking the Victorian parliament to investigate why the violence was allowed to escalate.

"We have a number of people who are injured as a result of yesterday," Mr Finn told AAP.

"There was no attempt by police to control them at all."

He said he wouldn't be pressing charges but he will make a complaint to Victoria Police about the lack of action.

"I want an inquiry or investigation into why this was allowed to develop the way it did," Mr Finn said.

An estimated 3000 pro-life demonstrators attended the march calling for the Abortion Law Reform Act - which removed all legal protection for children before birth in 2008 - to be repealed.

Mr Finn says "numerous" incidents of violence were reported to him.

Victoria Police played down the protests, saying there were a couple of scuffles between opposing groups but it stopped once police intervened.

"No one has been charged with assault and no matters have been brought to the attention of police," a spokeswoman said.

Pro-choice rally organiser Liz Walsh said having thousands of people on the streets of Melbourne saying abortion should be criminalised was a very dangerous thing.

She denied the protest had gotten out of hand.

"It was definitely lively and defiant and confrontational but it was definitely not violent."