Wino,
For your information, the London Underground has a number of unions in operation. The incident to which flaps to 60 refers occurred when a non-RMT (the striking union) employee attempted to get to work. Incidentally they are not the largest of the driver unions, and harrassment of someone else getting to work is not on when it is ASLEF who generally control driver negotiations, and who themselves were not on strike.
The background to that recent strike appears to many in London to be a case the union flexing its muscle rather than for genuine reasons of pay or safety. To cross the line of that union is hardly SCAB behaviour.
Oh and if it were theft, don't you suppose it might be illegal? Perhaps you are unaware of many working practices of UK unions, who appear to think that daylight robbery from their employers is OK?