The migratory work pattern compounded the problem of

English as a Second Language English Vocabulary, Grammar and Idioms
1

The migratory work pattern compounded the problem of labor organization.
What is “migratory work pattern”?

2

“migratory work pattern” refers to a habit of people travelling to other areas of the country, or other countries, in order to find work. For example, in the summer people might travel to an agricultural area to pick produce.