Regulations on a free market economy like anti trust laws, labour and environmental, etc. have little to do with socialism. Actually, socialist economy lacks those same laws especially the worker protection rules and anti monopoly laws. The modern free market model emerged along the rise of representative governments. Hence, capitalism is tempered by the electoral influences of the middle class. The pure capitalism, as witnessed, mid 19th century and on, was unencumbered by today's restrictions and, therefore, predatory. The socialists(Marx et all) correctly indentified the problems, but offered unworkable solutions like collectivism and nationalization of industries. Unfortunately, the 19th century theories are very much alive, to this day. Why they call them progressive, I don't know since it is an objective historical fact that socialism does not work because of the human nature and the simplest fact that, in the end, someone must pay for it. In the nut shell, we can only have as much socialism as we can afford.