Ginsberg most likely makes this allusion to García Lorca to show his respect for Lorca for being an unconventional poet.
Ginsberg admired Lorca and mentioned him in his poem. Lorca was killed in the Spanish Civil War by the right wing Nationalists because he had leftist ideas as well as Ginsberg did. Ginsberg and Lorca admired Walt Whitman. The latter wrote Ode to Walt Whitman. They were both, Lorca and Whitman unconventional poets who disregarded poetical rules and structures, and praised free expression of thoughts and feelings. Lorca and Whitman, both promoted sexual freedom through veiled references in their poems.