Liberty Victoria president Jessie Taylor warned of an "extraordinary incursion into free speech" in Mr Morrison's stated intention when the right to protest and boycott was at the heart of most liberal democracies.
"This represents a further significant erosion of that right, from a prime minister whose rhetoric around the right to protest is beginning to sound feverish," said Ms Taylor, also a lecturer at Monash University.
"The notion that a government could outlaw a boycott is legally questionable and morally dubious."