What was one reason union membership rose in the 1930s?

a. congress outlawed the closed shop.

b. the afl and cio reunited.

c. congress passed pro-union laws.

d. the afl was founded.

The correct answer is c. congress passed pro-union laws.

Unions were usually not supported by the congress because it was believed that unions could actually be political organizations and that they want to change governments. When the congress realized that they just want better working conditions, they started making acts that supported workers and many workers started joining unions.