Insurance broker Steadfast Group Ltd (ASX:SDF) – the subject of an overnight Four Corners investigation – has seen $600M wiped off its value as the company dips -12% in afternoon trades. At the centre of the catalyst behind this sell-off is the Australian Broadcasting Corporation (ABC), which became the subject of a Steadfast announcement released on Monday shortly after it declared a trading halt. “Steadfast Group refers to matters raised by the ABC in this morning’s media,” the company wrote on Monday, referring to an article that went live before the nightly broadcast. “We refute the allega…