WiseDragonfly,
As others have said, when a supervisor does bargaining unit work, he is taking money from you, or some other member of the bargaining unit. The money taken may sometimes be overtime money.
The supervisor is also creating a false impression that the work can reasonably be done in a given amount of time with a given amount of workers. Later these false impressions will become part of false written reports. This will come back to bite you or those who do your job after you.
Assuming the supervisor doesn't arrange for contractually mandated Pension and Health & Welfare contributions to be made, then he is also stealing about $14 per hour from the benefit funds. (The exact figure varies by region.)
Anyone have a guess as to how many millions are not contributed to the various funds nationwide as a result of supervisors working? Isn't this at least one reason the funds are underfunded?
$14 an hour is more than most part-timers make, as it would take a new hire about seven years to make that wage. By that time the contribution rates would have increased yearly, so they would still be making less than the contribution rates.
If you are in the bargaining unit, it doesn't matter if you are in the Union or not, you are fully covered by the entire Contract and bound by all of it's provisions, (as is UPS, even though management is not in the Union either.)
If the shoe was on the other foot, and you were caught stealing money and falsifying reports, what do you think your management would do to you?