Judge Fisher seemed ready today to begin imposing jail terms to those who have violated a back-to-work order he issued last Wednesday.
Most of the 13,000 striking controllers defied the back-to-work order, and were dismissed by President Reagan on 5 August.
Unions traditionally oppose back-to-work orders as government interference in contract disputes.
But some workers defied the back-to-work order.
Officials of the school board, which sought the back-to-work order that led to the jail terms, also believe the judge has gone too far.
But, his cabinet did put emergency regulations into effect to allow the government to issue back-to-work orders to keep essential services operating.
Three days of angry contempt of court hearings for defiance of a back-to-work order have made that seem unlikely.
At a court hearing scheduled for Tuesday, officials will ask a state judge to find the teachers in contempt for violating a back-to-work order.
Striking professors at Temple University agreed by a slim margin today to return to their jobs while their union appeals a judge's back-to-work order.
The wildcat strikers have ignored repeated back-to-work orders from Federal judges.