What is the main function of the central committee of the major political parties?

In the United States the two major parties are administered by the Democratic National Committee and the Republican National Committee; these act as the leading bodies of those organizations at the national/administrative level, as well as local committees in a similar capacity within the local Democratic or Republican

Explanation:

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in mcculloch v. maryland (1819) the supreme court ruled that congress had implied powers under the necessary and proper clause of article i, section 8 of the constitution to create the second bank of the united states and that the state of maryland lacked the power to tax the bank.

gibbons v. ogden, (1824), was a landmark decision in which the supreme court of the united states held that the power to regulate interstate commerce, granted to congress by the commerce clause of the united states constitution, encompassed the power to regulate navigation.