Harry T. and his wife Harriette V. were the first true civil rights activitists of the modern civil rights era in the State of Florida.

Harry T. Moore organized the first Brevard County branch of the NAACP in 1934 and became its president. He would later travel throughout the state organizing branches and 1941 organized and became President of the Florida State Conference of NAACP branches.

In 1945 he formed the Florida Progressive Voter's League and became its Executive Director. This organization was instrumental in helping register over 100,000 black voters in the State of Florida .