The Thessalonian mob claimed that Paul and Silas had turned what upside down?

Answer: The world

Dragging Jason before the officials, the mob shouted, "These men who have turned the world upside down have now come here."

“But when they could not find them, they dragged Jason and some other brothers before the city officials, shouting, “These men who have turned the world upside down have now come here,”— Acts 17:6 (BSB)