LCSH Week 45: of aulacigastridae and jellyfish blooms, broiling chickens and doom metal

The Lower East Side Librarian Library of Congress Subject Headings of the Week for Week 45, November 10, 2010 are:

(A) 150 Aulacigastridae [May Subd Geog] [sp2010014255]
053 QL537.A9 (Zoology)
450 UF Aulacigastreridae
450 UF Aulacigastrid flies
450 UF Aulacogasteridae
450 UF Aulacogastridae
550 BT Diptera

150 Broilers (Chickens) [May Subd Geog] [sp 85017028]
* 450 UF Broiling chickens

150 Communist trials [May Subd Geog] [sp 85029191]
* 680 Here are entered works on trials in which the defendants are accused of political crimes such as sedition, conspiracy, or treason, in connection with their belief in the philosophy of communism or their membership in a communist party or organization.
* 550 BT Trails (Political crimes and offenses)
* 550 BT Trials (Sedition) CANCEL
* 550 BT Trials (Treason) CANCEL
Communism no matter automatically a subdivision of sedition and treason? Very progressive, LC!

(C) 150 Doom metal (Music) [May Subd Geog] [sp2010013960]
550 BT Heavy metal (Music)

(C) 150 Flight delays [May Subd Geog] [sp2010014293]
450 UF Air travel delays
450 UF Airline flight delays
450 UF Delays, Flight
550 RT Aeronautics—Flights
This heading is dedicated to Barnard Library Dean Lisa Norberg, whose flight was delayed five hours when her flight crew got in a car accident on the way to the airport.

(C) 150 Jellyfish blooms [May Subd Geog] [sp2010014178]
450 UF Blooms, Jellyfish
450 UF Jelly blooms
550 BT Plankton blooms

(A) 150 Trees on postage stamps [sp2009030029]
550 BT Postage stamps
I just don't understand how there's justification for this heading and not for butch and femme headings. For real. Please explain.