Names
- Nielson, Axel.1
- Niemðoller, Martin, 1892-1
- Niemöller, Martin, 1892-1
- O'Brien, Patrick H. (Patrick Henry), 1868-1959.1
- O'Brien, Patrick Henry, 1868-1959.1
- O'Connor, Jessie Lloyd1
- O'Connor, Jessie Lloyd, 1904-1
- Olmstead, Mildred Scott1
- Olmsted, Mildred Scott, 1890-1990.1
- Osborn, Curtis.1
- Page, Kirby, 1890-1957.1
- Paul, Alice, 1885-1977.1
- Pauling, Linus, 1901-1
- Pauling, Linus, 1901-1994.1
- People's Council of America.1
- Porter, David R1
- Porter, David R.1
- Potter, Charles E. (Charles Edward), 1916-1979.1
- Prohibition Party (U.S.). National Committee.1
- Puri, J. N.1