Random Weingarten has been reported as being a member of Democratic Socialists of America, a MARXIST nation organization whose leadership has become more MARXIST since the early 1980s.
See www.DiscoverTheNetworks.com or .org
The same for the highly specialized and constantly updating their data on MARXIST extremist groups and individuals, www.keywiki.org.
The original name of the Communist Party of the Soviet Union was the Social Democratic Party of Russia, so no surprise there.