rabid feminist politicians

Well, this extends the semantic range a touch beyond the source term's, since you could have some rabid feminist MPs who are also male diputados. Still, the idiomatic collocation is "rabid feminist," not "rabid female." The proof that it's idiomatic is in the OED getting in hot water for it recently (see https://www.washingtonpost.com/news/morning-mix/wp/2016/01/2... ). Since your source article doesn't sound overly concerned with being PC, the term might happily find a home here. I'm assuming that the source writer was coming down on the diputadas in question for being aggressively feminist rather than for just being women. In the latter case, "rabid women politicians" or might convey that particular prejudice.

"Rabid" also has an aggressive, canine connotation with "hyena."

For the rest of it, "politician" covers more political systems than "MP" or "congresswomen," is more precise than "representatives" (which includes special interest and lobby groups outside of govt), and is less clumsy than "elected official" (as in the lengthy "rabid feminist elected officials").

Whatever term you go with, have fun with the rest of the your ranting op ed!

In addition to 'squawking' and 'cackling,' other verbs referring to annoying sounds associated with other species (including 'squealing') may work too, though care needs to be taken to ensure the critical tone is consistent with that of the author.

It reminds me of US president Roosevelt calling his Panama Canal detractors "a small body of shrill eunuchs" quoted in "Gunboat Democracy" (2006), which I rendered as "un pequeño grupo que chilla como eunuco" (for a discussion of 'sarcasm-laden humor' in political discourse, see my doctoral thesis, "Metaphor and agency in the English-Spanish translation of texts in the social sciences," referenced in my ProZ profile).