I don't get that output with your regex:

use warnings;
use strict;

while (<DATA>) {
    print if /^([A-Z]+\s[A-Z]+,)/;
}

__DATA__
ABU BAKR, Ibrahim Ali Muhammad (a.k.a. AL-LIBI, Abd al-Muhsin)
(individual) [SDGT]
AFGHAN SUPPORT COMMITTEE (ASC) (a.k.a. AHYA UL TURAS; a.k.a. JAMIAT
AYAT-UR-RHAS AL ISLAMIA; a.k.a. JAMIAT IHYA UL TURATH AL ISLAMIA;
a.k.a. LAJNAT UL MASA EIDATUL AFGHANIA) Grand Trunk Road, near
Pushtoon Garhi Pabbi, Peshawar, Pakistan; Cheprahar Hadda, Mia Omar
Sabaqah School, Jalalabad, Afghanistan [SDGT]
[download]

prints:

ABU BAKR, Ibrahim Ali Muhammad (a.k.a. AL-LIBI, Abd al-Muhsin)
[download]

See http://sscce.org