Answer:
1. the state and federal agencies;
2. because they are ignorant of the effects of the chemicals.
Step-by-step explanation:
1. The context of her statements shows she was referring to the state and federal agencies who were mandated and overzealous about getting rid of insects they deemed harmful. She said,
"The crusade to create a chemically sterile, insect free world seems to have engendered a fanatic zeal on the part of many specialists and most of the so-called control agencies," she clarified who she was referring to when she said, "The most flagrant abuses go unchecked in both state and federal agencies."
2. By calling them "control agencies" Carson was revealing that they (the state and federal agencies) were as she put it, "wholly ignorant of their potentials for harm." That is, they were ignorant of the harmful effects that those chemicals which they advocated for had on the environment. All they knew and were concerned about was to control insects.