WASHINGTON — The Justice Department declared Monday that Steve Bannon should serve six months behind bars and pay a $200,000 fine for defying a congressional subpoena from the House committee investigating the Jan. 6 insurrection at the U.S. Capitol.Convicted last summer, the longtime ally of former President Donald Trump should get a hefty sentence because he “pursued a bad-faith strategy of defiance and contempt” and he publicly disparaged the committee itself, undermining the effort to get to the …