HOUSTON—President Joe Biden’s administration has deported hundreds of immigrants in its early days despite his campaign pledge to stop removing most people in the United States illegally at the beginning of his term. A federal judge last week ordered the Biden administration not to enforce a 100-day moratorium on deportations, but the ruling did not require the government to schedule them. In recent days, U.S. Immigration and Customs Enforcement has deported immigrants to at least three countries: 15 people to Jamaica on Thursday and 269 people to Guatemala and Honduras on Friday. More deportation flights were scheduled Monday. It’s unclear how many of those people are considered national security or public safety threats or had recently crossed the border illegally, the priority under new guidance that the Department of Homeland Security issued to enforcement agencies and that took effect Monday. Some of the people put on the flights may have …