for context: i support a cross between market socialism, welfarism and georgism under a party-union/minarchist government (a small-enough government where the political parties work with the unions). i think that minarchism is a required step in a democratic dictatorship of the proletariat.
my socialist views are therefore a fusion of libertarian market socialism and de leonism and such.
NO mass de leonist organizations? you HAVEN’T heard of the socialist labor party (which by the way is still around)?
77 members in 2006 is a mass organization to you? Also I don’t think they are active since 2006
they had a national convention in 2007 apparently, the last one that is recorded
there’s also the Industrial Workers of the World which has ties to De Leonism (but is NOT a political party, but close enough)
I am pretty sure that IWW is a revolutionary unionist org, which makes it opposed to de leonist peaceful reformism
it has fewer members than the us house of representatives