Final answer:
The "plumbers" were connected to President Nixon through their involvement in illegal activities aimed at spying on and discrediting his political enemies.
Step-by-step explanation:
The "plumbers" were connected to President Nixon through their role in illegal activities, such as spying and break-ins, which were carried out to spy on and discredit his political enemies. The plumbers were initially hired to prevent leaks of information that might harm the White House, but their operations expanded to include a variety of illegal activities.