Henry VIII of England | Henry VIII | Henry Kissinger | Henry Wadsworth Longfellow | Henry II of England | Henry II | Henry III of England | Henry IV of France | Henry IV | Henry | Henry Ford | Henry James | Henry VII of England | Henry III | Henry Moore | Henry Miller | Henry I of England | Henry Clay | Henry IV of England | Patrick Henry | Henry Mancini | Henry V | Henry David Thoreau | Joseph Henry Blackburne | Henry V of England | Henry VI of England | Henry VII | Henry II of France | Henry Fonda | John Henry Newman |
In 1891, Barnes joined the Socialist Labor Party of America (SLP), remaining an active member of that organization until the 1899 split headed by Henry Slobodin, Morris Hillquit, and individuals close to the New Yorker Volkszeitung newspaper.