Vicki Momberg was found guilty on four counts of crimen injuria for racially abusing a police officer in 2016.
Satawu's Solomon Mahlangu says the strike will affect several short and long distance bus services across the country.
Scientists have been working for months trying to identify the origin of the listeriosis outbreak in the country and have now made a breakthrough.
The deputy minister made his first appearance in court on Thursday for assault after admitting to assaulting Mandisa Duma at a Johannesburg nightclub at the weekend after she apparently called him gay during an argument.
Earlier this week CPS and Sassa confirmed that verbal consensus had been reached for a new contract, but no deal has yet been signed.