happy labour day 1 may. male and female standing looking at sky. engineering concept with screwdriver wrench ruler vernier

abour agenda american background banner bar business caliper celebration cheater communist concept congratulate construction contractor country day design employers employment engineering female flat flyer freedom greeting happy holiday illustration industry international key label labour looking male may mechanism national occupation organize pipe poster power race repair revolution ruler screwdriver sky socialism spanner standing steel sticker symbol technical together tool usa vernier victory workers working wrench