Caroline Decker Gladstein was a labor activist in the 1930s in California. A member of the Communist Party, as many activists were, she was an organizer for the Cannery and Agricultural Workers’ International Union (CAWIU). Decker helped organize the massive California agricultural strikes of 1933 during the Great Depression.

The California agricultural strikes of 1933 were a series of strikes by mostly Mexican and Filipino agricultural workers throughout the San Joaquin Valley. More than 47,500 workers were involved in the wave of approximately 30 strikes from 1931 to 1941. Twenty-four of the strikes, involving 37,500 union members, were led by the Cannery and Agricultural Workers' Industrial Union (CAWIU). The strikes are grouped together because most of them were organized by the CAWIU. Strike actions began in August among cherry, grape, peach, pear, sugar beet, and tomato workers, and culminated in a number of strikes against cotton growers in the San Joaquin Valley in October. The cotton strikes involved the largest number of workers. Sources vary as to numbers involved in the cotton strikes, with some sources claiming 18,000 workers and others just 12,000 workers, 80% of whom were Mexican.