Students at a private Sydney Catholic college are being used to stack Liberal Party branches in a plan to oust Federal MP Alex Hawke, with claims some are being offered parliamentary jobs in exchange for recruitment efforts.

The latest move to stack Liberal branches in Sydney's hills region - this time with Campion College students - has angered politicians in Canberra and NSW, with one senior MP calling for an investigation and for those responsible to be ousted from the party.

The grounds of Campion College, a tertiary liberal arts college. Credit:Simon Alekna

The Sydney Morning Herald understands about 20 Campion students have signed up to the party, with more than a dozen listing the college as their address. There are about 90 students at the college.

The students at the liberal arts tertiary college said they were approached by other classmates and current or former NSW parliamentary staff to join.