Answer: People didn't cross picket lines to show solidarity in an attempt for better wages, better working conditions and various other things that would or could make their lives better.
Explanation: Back in the 50's and 60's when unions were very strong, you were considered a "scab" if you crossed a picket line. You took a chance of being hurt, harassed by other strikers and you showed you were not a team player.
The first-world countries, most especially the superpowers always extend their help in order to further the develop the respective economies of the third-world countries. In addition, they provide financial aid and send economic consultants in order to have their economies self-sustainable.
Farmers and other employees paid tithes to the government, and administrators controlled the communal labour required to maintain aqueducts, irrigation canals, and water resources. They aided merchants and dealers as needed, as well as ensuring the safety of caravans.
Is the person from the middle ages a monk