In your opinion how did organized labor become too powerful in 1930's?

Answer 1

I would hardly say it became too powerful...the government did back labor to some extent, passing section 7(a) of the NRA which granted unions the right to collectively bargain, and its replacement, the Wagner Act, which did the same along with some other rights, but at no point was labor calling the shots. Nor did a Labor party ever emerge. One could note that there were several big successful strikes, such as the Flint sit-down strike, where the UAW managed to win concessions from GM through the new, controversial and ultimately unconstitutional tactic of the "sit-down".

Answer 2

They were not powerful at all, compared to organized labor in other democratic industrialized countries of the time. American unions were weakened by the "Red Scares" like the "Palmer Raids" in 1919. The CIO seceded from the AFL in 1938. The Wagner-Connery Act - signed into law on July 5, 1935 - wasn't really enforced until 1937 by "National Labor Relations Board v. Jones & Laughlin Steel Corporation".