Mumbai - On Wednesday, MNS workers had taken Sanjay Darade, chief engineer of the BMC’s Roads Department, to Dadar and made him stand with a placard that stated he was responsible for the condition of city’s bad roads. 4,200 civic engineers have threatened to go on strike on Saturday if strict action isn’t taken against MNS corporators. MNS workers, including corporators Sandeep Deshpande and Santosh Dhuri, had gone to meet Darade at his Worli office on Wednesday. The MNS corporator had earlier said that they had given a deadline of October 5 and Darade had to take the blame for not filling hundreds of potholes. A complaint against the party workers was filed with Shivaji Park police station yesterday itself.