Original sentence: " Spooner's membership to the socialist First International and opposition to wage labor is why historians like James Martin and Peter Marshall  consider him an anti-capitalist left-libertarian and libertarian socialist
Edited sentence: " Spooner's membership to the socialist First International and opposition to wage labor is why some consider him an anti-capitalist left-libertarian and libertarian socialist.Others have rejected his status as a socialist given his adherence to Lockean values and property rights, considering him instead to be an anarcho-capitalist and a propertarianist