I worked for UPS for about 6 months during college. They have some of the worst working conditions I have ever experienced and I have worked in a lot of different places. Employees cannot go to the toilet without permission from their supervisor. At one point, I was at the end of a conveyor belt feeding boxes down into a semi-trailer for other employees to load. If those emplyees slowed down, or I failed to work fast enough, more boxes would come down the conveyor, piling up, over my head, knocking me down and falling everywhere. Never would the supervisor approve the stopping of that conveyor to rectify the problem.
In addition, at that time, after x (39?) consecutive working days, an employee automatically joined the union. It was routine for management to call employees on the 38th day and tell them not to come in to work the next day. The 39 day period would then have to start all over again. My brother-in-law worked full time for them for a couple of years and was never able to get the required number of consecutive days of employment to join the union.

So, while the pay was pretty decent, the company verifies Marx's view of corporate capitalism quite nicely.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13