Why did labor unions gain power and union memberships soar during the 1930s? a)fdr’s administration and new deal legislations were pro-labor. b)unions had more clout after the successful “sit-down strike” at general motors. c)fdr’s administration veered toward a communist, not capitalist, ideology. d)the cio was established for unskilled workers that couldn’t join the afl. e)unions financially troubled workers vent their frustrations against employers.