Lorenzo Martinez Tañada Sr., or Ka Tanny CCLH (born Lorenzo Tañada y Martinez; August 10, 1898 – May 28, 1992), was a Filipino nationalist lawyer, senator, and human and civil rights activist best known for his staunch opposition to martial law under Ferdinand Marcos. He is also equally renowned for his efforts to stop the continued presence of US military bases in the Philippines through the Anti-Bases Coalition (ABC), the main opposition group founded by Sen. Jose W. Diokno, the father of human rights, and Tañada. Senators Tañada and Diokno, who were both attorneys, founded the Free Legal Assistance Group (FLAG), which is the largest group of human rights lawyers nationwide. Tañada was also the chairman of the Justice for Aquino, Justice for All (JAJA) movement that sought to oust Marcos after the assassination of former Sen. Ninoy Aquino. He was also the founding chairman of a merged party called PDP-LABAN that opposed Marcos in the 1978 elections, and he founded the Nuclear-Free Philippines Coalition or NFPC, which successfully sabotaged the opening of the Bataan Nuclear Power Plant under the Marcos administration. Serving in the Philippine Senate for 24 years beginning in 1947 until 1971, he is the longest-serving senator in Philippine history and is referred to as the "Grand Old Man of Philippine Politics."