CAIRO — In one of Cairo’s most crowded quarters, where streets are so filled with trash that bulldozers scoop it up, the Muslim Brotherhood has opened not one but two offices. Its most conservative counterpart has followed suit. An Islamist do-gooder with forearms as broad as the Nile has vowed to win a seat in Parliament.

Egypt’s parliamentary election may be more than a month away, but the contest has already begun in the neighborhood of Imbaba, where the arc of the Egyptian revolution is on display. The clarity of the revolt has given way to the ambiguity of its aftermath, and Islamic activists here who failed to drive the popular uprising — some, in fact, opposed it — are mobilizing to claim its mantle amid the din of protests, confusion and, last week, violence.

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