a) two-day weekend
How is this a right? Some people want to work less; some want to work more. If it were forced by unions, forcing a two-day weekend stops people from working more.
b) paid holiday
Same; not everyone wants paid holidays as opposed to getting more money in their pockets.
c) minimum wage
The minimum wage stops less skilled people from working; this especially affects blacks and teenagers. I see the minimum wage as a negative effect of unions (nobody wants their job to be replaced by a cheaper worker).
d) Again, not everyone wants to work an 8-hour day. Poor people want to work more and other people want to work in different schedules (like a 3 day week).
It is not clear to me why a), b), and d) can't be achieved without unions if people wanted those 3.
I have no problem with people having a), b), and d) voluntarily and unions persuading people and employers for those causes; but I don't want workers to be forced to have those three (there's no free lunch--these worker "rights" come at the expense of the worker's salary).