None, John Sinclair didn't write The Jungle; Upton Sinclair did. Upton Sinclair was a socialist and a writer (and a future candidate for governor of California) who exposed the conditions in the meat packing industry in his 1906 novel, The Jungle. John Sinclair was a poet (and the manager of the Detroit-based rock group, the MC5) who, because he was sent to prison after selling two joints to a narcotics officer in Michigan, became the subject of a John Lennon song.
John Adams did a great number of things with the intent to help America. John Adams signed the Declaration of Independence for example.
John Hancock
John Adams
John Locke was an English philosopher whose writing was inspirational to the American Revolutionaries; he did not personally fight in the revolution.
Muckrakers. They would rake up all the 'muck' (corruption) and expose it for everyone to see. People: Jacob Riis - Photographer who took pictures of horrible living conditions and published them. Ida Tarbell - Writer in McClure's magazine, John D. Rockefeller ruined her and she tried to get revenge by exposing his corrupt ways Upton Sinclair - Author of The Jungle, a novel that exposed the disgusting conditions of the food industry.
For the jungle tales I think it is John Quinn, but if you mean the Jungle book then its Edgar Rice Burroughs
John Gordon Sinclair is 6' 2".
John Alexander Sinclair was born in 1897.
John Alexander Sinclair died in 1977.
John Sinclair Morrison died in 2000.
John Sinclair Morrison was born in 1913.
John McHardy Sinclair was born in 1933.
John McHardy Sinclair died in 2007.
John Sinclair - bishop - died in 1566.
John Sinclair - song - was created in 1972.
John Ewen Sinclair died on 1949-12-23.
John Ewen Sinclair was born on 1879-12-24.