CAIRO — Egypt’s military-backed leaders on Wednesday designated the Muslim Brotherhood a terrorist organization, outlawing the country’s most successful political movement and vowing to treat anyone who belongs to it, or even takes part in its activities, as a terrorist.
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Egypt’s leaders have been in conflict with the movement since July, when the military deposed Mohamed Morsi, Egypt’s first democratically elected president and a former Brotherhood leader. State forces have killed hundreds of the group’s supporters during protests against Mr. Morsi’s removal. Most of its leaders and thousands of its members have been imprisoned.

Now, with Wednesday’s decision, the government signaled its determination to cut off any air to the more than 80-year-old Islamist organization.

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