Final answer:
The US Handicapper General feared Harrison in the short story "Harrison Bergeron" because of his extraordinary intelligence and physical abilities.
Step-by-step explanation:
In the short story "Harrison Bergeron," the US Handicapper General feared Harrison because he possessed extraordinary intelligence and physical abilities. Harrison's intelligence and abilities posed a threat to the government's objective of maintaining strict equality among all individuals. The government feared that if Harrison were allowed to fully use his talents, it would disrupt the balance they had established.