In my previous company - one that desperately needed such action BALPA made it abundantly clear on numerous occasions over the years that "working to rule", such as turning up on time as opposed to the usual 20 minutes early in order to get a briefing done in the 5 minutes "allowed" or declining to go into discretion was illegal action and contrary to all union rules and agreements and would result in all sorts of personal sanctions.
Apparenetly, they said, if you habitually bend over and show up early (many FOs routinely turned up 30 mins before report time imagining it earned them kudos and always fraudulently declared an imaginary report time - frequently busting min rest) , require as much time as you actually need for a briefing (as opposed to how much the Co. "allows" you) or do discretion as a matter of course then you somehow de-facto agree to this as a normal part of your contract and by withdrawing it you are in breach of contract - despite what is being happily accepted by the company being demonstrably illegal, unsafe or by definition not theirs to expect, yet the flatly refuse to condemn such blatantly illegal procedures.
It's an outrageous abuse of the goodwill/desperation of particularly junior aircrew though this cancer is advancing through the ranks with seniority as airmanship gives way to P2F kowtowing as they are now increasingly taking over the LH seats. Not that my generation was much better at defending ourselves, we just had even less to lose.