Actor Jim Carrey took to Twitter Tuesday night and unleashed a slew of heated tweets challenging California's new immunization bill that requires children at school and daycare to be vaccinated.

Only a serious medical reason could exempt a child from receiving vaccination, personal and religious objections were not accepted.

E! News reported that the 53-year-old actor believes there is a link between vaccines and autism and has been an activist on the controversial issue ever since his relationship with Jenny McCarthy, who believes that her son's autism stemmed from vaccination.

Carrey called California Gov. Jerry Brown out as a "corporate fascist" that "must be stopped" in his first tweet, after Brown signed the bill into law.

"California Gov says yes to poisoning more children with mercury and aluminum in mandatory vaccines," he said.