What is associated with: a strike by this union shut down ups for 15 days in 1997?

What is referred to by 'a strenuous effort'? Based on the clue 'a strict often literal adherent to a faiths tenets...', what is the answer? Based on the clue 'a strict one of these 15 letter words tends to int...', what is the answer? What is referred to by 'a strict rule enforcer'? What is associated with: a strike for better pay by the workers of the bo in july 1877 soon spread to other companies i… Based on the clue 'a strike is a stoppage of work by the workers thi...', what is the answer? What is associated with: a strike started by workers of this railroad co paralyzed the us economy in 1894 until broken… What is associated with: a strike was organized in 1870 by these knights of the key?