Question

Why does Truman feel the act is radical and not “moderate,” as some in Congress claim

Answer 1

Assuming that you're referring to Taft-Hartley labor bill, 

President Truman feels that this act give too much power to the employers.
This act granted the ability for the employers to restrict the activities and power of the labor union

hope this helps

Answer 2

The answer is

Truman states that the bill is radical because it would deliberately weaken labor unions by removing their bargaining power.

I hope this helps you

make me brianliest please