From wikipedia:
a businessman who is the founder and chairman of Massar International since its establishment in 1994. He is the founder of Rawabi, the West Bank’s first planned city, and the founder and the CEO of Bayti Real Estate Investment Company that built the city.[1][2] He founded and manages the first Palestinian equity fund, a $90 million investment initiative known as “Siraj Fund”.[3] He is on the list of the “Top Ten Richest People of Palestine in 2016.” Masri was named by the World Economic Forum as a Global Leader of Tomorrow and ranked among the World’s 50 Greatest Leaders in 2018 by Fortune magazine.
Masri is chairman of the Palestine Development and Investment Company [4]
Masri was born in Nablus, in the occupied West Bank, then under Jordanian rule.[5][6] At 14 years old, Masri began throwing stones and organizing demonstrations, leading him to be jailed by Israel eight times.[7] At age 16, Masri’s father sent him to school in Egypt after he was released from prison and missed exams.[8] After leaving Nablus, Masri continued his education in Egypt, before moving to the United States, where he graduated from Virginia Tech with a B.S. in chemical engineering in 1983.[9][10]
It sounds like he aided a terrorist organization to commit murder and kidnappings. If he is a US citizen he deserves due process under the law. If he is not a US citizen, he should be immediately returned to his nation of origin. He can apply for citizenship from there, and the decisions about if he is a terrorist can be made before re-admission.