Innovation & Wealth › Mass production & the consumer age › The New Deal
Wagner Act: legal right to unionize
July 5, 1935· Law or policy· Laws, labor & antitrust
Well documentedSolid records, texts or physical evidence.
The 1935 National Labor Relations Act guaranteed most private-sector workers the right to join unions and bargain collectively.
See it on the Innovation & Wealth map →What happened
Sponsored by Senator Robert F. Wagner and signed July 5, 1935, the law protected organizing, bargaining and strikes. It banned 'unfair labor practices' such as firing union supporters or setting up company-run unions, and created the National Labor Relations Board to hold union elections and enforce the rules. Upheld in 1937, it helped union membership rise from about 3 million in 1933 to over 14 million by 1945. Farm and domestic workers were excluded. The 1947 Taft–Hartley Act later limited union power.
Impact on society and the economy
Industrial workers gained bargaining power and a larger share of postwar profits, building a blue-collar middle class. Employers lost sole control over wages and work rules.
How we know
The statute, NLRB v. Jones & Laughlin Steel (1937), NLRB election records, and union membership data from the Bureau of Labor Statistics and labor economist Leo Troy.
Still debated
Economists debate how much unions raised wages beyond their own members, and why private-sector membership fell to about 6% today.
Connections (3)
▸Labor unions and the AFL won legal recognition through Wagner Act: legal right to unionizeWell documented
The connection
For decades unions had no legal right to recognition: employers fired organizers, hired armed guards and won court injunctions against strikes. A 1932 law curbed injunctions, and a 1933 promise of bargaining rights proved toothless. After huge 1934 strikes in Toledo, Minneapolis and San Francisco, unions and their allies won the Wagner Act's enforceable rights.
When and how
United States, 1932–1937; AFL president William Green, the CIO's John L. Lewis, Senator Robert Wagner, and the 1936–37 Flint sit-down strikers at General Motors.
How we know
Legislative records show union lobbying; membership rose from about 3 million in 1933 to over 14 million by 1945, mostly in newly organized industries.
Debates
Historians debate how much the law caused union growth versus worker militancy, CIO organizing and wartime labor shortages.
▸The New Deal included Wagner Act: legal right to unionizeWell documented
The connection
The 1933 recovery law had promised workers bargaining rights, but it was weakly enforced, and the Supreme Court struck the law down in May 1935. Within weeks Congress passed Senator Wagner's stronger, enforceable bill, a centerpiece of the 'Second New Deal' alongside Social Security. Roosevelt, initially lukewarm, signed it July 5, 1935.
When and how
Washington, 1935; Senator Robert F. Wagner, President Roosevelt and Labor Secretary Frances Perkins. The Supreme Court upheld it in April 1937.
How we know
The statute, congressional records and the Supreme Court's 1937 decision in NLRB v. Jones & Laughlin Steel.
Debates
Historians debate whether the law came from the administration's plans or from pressure by strikers and Congress; Roosevelt endorsed it late.
▸Wagner Act: legal right to unionize helped unions share the gains of Postwar boom and the rise of the middle classMostly agreed
The connection
The 1935 Wagner Act guaranteed private-sector workers the right to organize and bargain collectively. Union membership rose to about a third of private-sector workers by the mid-1950s. Big contracts like GM's 1950 'Treaty of Detroit' tied wages to productivity and added pensions and health insurance, spreading boom gains to blue-collar workers and setting standards for non-union firms.
When and how
US factory towns from 1937, when GM and U.S. Steel recognized unions, through the 1950s; membership peaked around 1954; the 1947 Taft-Hartley Act limited some union tactics.
How sure are we?
Union membership statistics, contract texts and wage data show union wages rising with productivity; studies link unions to the era's narrowing income gaps.
Debates
Economists debate how much unions narrowed inequality versus tight labor markets, high taxes and education gains, and whether union costs later sped the decline of unionized industries.