The Seventh Congress of the Comintern made a change in line official in 1935, when it declared the need for a popular front of all groups opposed to fascism. The CPUSA abandoned its opposition to the New Deal, provided many of the organizers for the Congress of Industrial Organizations and began supporting civil rights of African Americans. The party also sought unity with forces to its right. Earl Russell Browder offered to run as Norman Thomas' running mate on a joint Socialist Party–Communist Party ticket in the 1936 presidential election, but Thomas rejected this overture. The gesture did not mean that much in practical terms, since by 1936 the CPUSA was effectively supporting Roosevelt in much of his trade-union work. While continuing to run its own candidates for office, the CPUSA pursued a policy of representing the Democratic Party as the lesser evil in elections. Party members also rallied to the defense of the Spanish Republic of 1931-1939 during this period after a Nationalist military uprising moved to overthrow it, resulting in the Spanish Civil War (1936–1939). The CPUSA, along with leftists throughout the world, raised funds for medical relief, while many of its members made their way to Spain with the aid of the party to join the Lincoln Brigade, one of the International Brigades. Among its other achievements, the Lincoln Brigade became the first American military force to include blacks and whites integrated on an equal basis.