What was the main sources of campaign funds before 1971?

Before 1971, the main sources of campaign funds in the United States primarily included individual contributions, party funds, and corporate donations. Wealthy donors often played a significant role, and there were few regulations governing the amount of money that could be contributed. This led to a reliance on large donations from individuals and organizations, which raised concerns about the influence of money in politics. The lack of transparency and limits on contributions contributed to calls for campaign finance reform, culminating in the Federal Election Campaign Act of 1971.