During Roosevelt's terms, the Dem Party became more liberal (strengthen by the New Deal), as did the GOP. Large fractions of both Parties favored Unions and Civil Rights. But the conservative southern Dems were still a powerful pull. And even the conservative GOP fraction joined with the conservative Dem fraction in the McCarthy trials and other conservative events. Slowly, the shift away from mixed liberal/conservative political parties began during the 1950s push for Civil Rights, culminating in Kennedy's push for Civil Rights legislation, which was signed into law by Johnson. Although southern conservative Dems (who absolutely opposed Civil Rights legislation in favor of Jim Crow laws, e.g., Bull Conner) began to join the GOP in the 1950s (e.g., Strom Thurmond & Ronald Reagan), the biggest loss of southern conservative Dems came during and after the 1960s.