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Background Facts Separate suits were brought by the American Independent Party and the Socialist Labor Party , challenging the validity of Ohio election laws insofar as they precluded the parties ' being placed on the ballots to choose electors pledged to particular candidates for the Presidency and Vice Presidency of the United States ; the attack on the validity of these laws was rested on the ground that they violated the equal protection clause of the Fourteenth Amendment — on the ground that they denied plaintiffs and the voters who might wish to vote for them the equal protection of the laws , guaranteed against state abridgment by the Equal Protection Clause of U.S. Const .
 American Independent Party, Socialist Labor Party
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 American Independent Party, Socialist Labor Party