The people-to-people group license for legal travel to Cuba was created during the President Clinton administration (so it is not a new program). In January 2004, it was revoked by the Bush administration. It was reinstated and enhanced by the administration of President Barrack Obama, allowing US citizens to travel as individuals.
After President Trump’s Cuba announcement on June 16, 2017, the General License for People-to-people Educational Travel is once again ONLY available for Group Travel (individual people-to people-travel has been ended). It requires these trips to take place ONLY under the auspices of US organizations that promote people-to-people exchanges. All travelers must be accompanied by a representative of the sponsoring institution to observe that a full-time schedule of educational activities is maintained.
In other words, the trip should consist of a full-time schedule of activities intended to promote the exchange with ordinary citizens of Cuba. This full-time schedule must also include educational activities that result in meaningful interaction between American and Cuban nationals. Tourism remains prohibited.
Any US citizen can travel to Cuba legally with a sanctioned group under the people-to-people license for educational activities.