It’s a drizzly Tuesday morning at Glasgow’s High Court of Justiciary. On the docket are cases befitting its status as Scotland’s supreme criminal court: a murder sentencing, the start of a high-profile youth murder trial, and a serious organised crime group in the dock for money laundering and drug trafficking. The real drama, though, is happening outside on Mart Street. The security guards are on alert, focussed on a guy in his forties in a white shirt causing a stir on the street.