Elfyn Llwyd MP, who led a parliamentary inquiry on stalking, accused prosecutors of "undercharging" and called for a change in culture in the CPS and police, claiming stalking is too often treated as a domestic issue.
The Plaid Cymru Westminster leader said charging lesser offences often ends with a "slap on the wrist" and do provide justice for victims.
"We need to so make sure prosecutors take this very serious offence as they should because it is a considerable area of concern." Llywd said.
More top news
Manchester United manager Louis van Gaal says Ryan Giggs will almost certainly succeed him at Old Trafford.
David Cameron has apologised for experiencing "brain fade" after he forgot which football team he supports.
Fans can finally have their first look at Jared Leto's incarnation of the classic villain in 2016's Suicide Squad