Space Platform by Murray Leinster

The incoming shift had a messy clean-up job to do. It was accomplished only because security men abruptly took over the work of gang bosses, and all ordinary labor on the Platform was put aside until normal operations were again possible. Even that would not have been feasible but for the walkie-talkies the security men wore. As the situation was sorted out, it was explained to them, and they relayed the news for the satisfaction of the curiosity of those who worked under them. No work -- no explanation. It produced immediate and satisfactory co-operation all around.

There had been four separate and independent attempts to wreck the Platform at the same time. One was, of course, the plan of those sympathetic characters who had volunteered to help Mike and his gang win the status of spacemen by firing the Platform's rockets. There were not many of them, and they had lost heavily. They'd had thermite bombs to destroy the Platform's vitals. Ultimately the survivors talked freely, if morosely, and that was that.