The purpose of the 1964 freedom summer project in mississippi was

B)to help and encourage blacks to become registered voters.

Explanation:

interest groups send representatives to state capitals and to washington, d.c. to put pressure on members of congress and other policymakers. they engage in lobbying, or the organized process of influencing legislation or policy. lobbying can take many forms. interest groups can testify in congressional hearings.

the constitution gives congress the power to regulate commerce "among" the several states.