what US intelligence agency did johnson illegally authorize to spy on domestic dissenters

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The US intelligence agency that President Lyndon B. Johnson authorized to spy on domestic dissenters was the Central Intelligence Agency (CIA). However, it is important to note that authorizing the CIA to conduct surveillance on US citizens without proper legal authority was illegal.

To learn more about this topic, you can follow these steps:

1. Start by researching the period of Johnson's presidency, particularly the years between 1963 and 1969. Look for any information regarding CIA activities or surveillance during this time.

2. Review historical sources, such as books, articles, and official reports, that analyze the intelligence operations carried out by the CIA under Johnson's administration.

3. Pay attention to documents like the "Church Committee Report," which was an investigation conducted by the United States Senate in the 1970s to examine alleged abuses by intelligence agencies, including the CIA.

4. Explore the findings related to the CIA's surveillance programs, such as Operation CHAOS, which involved monitoring and infiltrating domestic groups critical or opposed to US government policies during the Vietnam War era.

5. By studying reliable sources and historical records, you can gather information to understand the extent of the illegal authorization given by Johnson and the activities of the CIA in spying on domestic dissenters.

Remember to critically evaluate sources, prioritize scholarly works, and cross-reference information to form a well-rounded understanding of the topic.