Source: March of Time, Newsreels, Vol. 3, Episode 2, September 30, 1936
From a summary:
Organized labor began to grow rapidly during the Great Depression. The growth and expansion into “mass production” industries brought in unskilled and semi-skilled workers who did not fit into the traditional craft union model of the American Federation of Labor. The result was a splitting off in 1935 of the CIO which practiced industrial unionism, the subject of this video. The split was not healed for 20 years. More recently, the AFL-CIO has again seen a splitting off of major unions in the Change to Win coalition.