Building workers have been threatened with $10,000 fines for rallying in Brisbane in support of union boss Michael Ravbar ahead of his appearance at a royal commission.

Several hundred unionists showed their solidarity for Mr Ravbar, the Construction, Forestry, Mining and Energy Union’s Queensland and Northern Territory secretary, by chairing him into Brisbane Magistrates Court. But the federal Fair Work Building and Construction (FWBC) agency has warned that they could face penalties of up to $10,200 if…