Fin24 has received several claims from business owners that the strike is heavily impacting small businesses.
While members of the union stand accused of intimidation and violence, the South African Police Service (Saps) are also being implicated.
The Saps are still to respond to Fin24 queries.
An owner of a Gauteng based company wrote to Fin24 saying his business was invaded while Saps members just looked on.
"A number of our staff joined the union just days before the strike".
He said that some of these unionised staff members threatened to call on the mobs to have staff who hadn’t joined the union hurt or even killed if they reported for duty.
His company has had no factory staff, drivers or store workers for three weeks now, but he refuses to be forced into submission.
"So we have no staff but are managing to keep the company running, but for who knows how long.
"We are doing as much as we can to keep the company afloat."
He said his company to collapsing during the protracted mining strike and "now Numsa’s strike is once again dragging the firm down".
"Now we are restructuring the company in order to keep it from having to close its doors."
He supplied Fin24 with CCTV footage that was also aired on Carte Blanche: