The source I believe, although I could be wrong on this was Shlomo Lorentz, the member of Knesset who had arranged the details of the historic meeting.
Furthermore,
I was personally told by a gentle, old widower who had learned in Novardok, that he had asked the Chazon Ish whether it is proper/appropriate to say yemach sh’mo on Herzl.The Chazon Ish told him yes, albeit inadvisable in most public settings
Do you doubt the gentle Chofetz Chaim stated that Amalek also included the bolsheviksas per the kovetz ma’amarim?First and foremost Leon Trotsky?
The same Leon Trotsky who upon being expelled from the Soviet Union was beseeched by the socialist labour movement of Palestine (including the younger Ben Gurion)to come and lead them.
(He regarded their petition with derision)
IN a city in the Midwest , R’ Shmuel Berenbaum was invited to stay at the home of certain professional . There was a portrait of Theodor Herzl hanging on the wall. He requested that it be removed prior to his stay.
These men of great stature were positive/tolerant,and far from being regarded as firebrands .
R’ Shmuel Berenbaum was buried in his plot in the largely Mizrach’ish Sanhedria cemetery
However they were of iron unyielding convictions towards any who they felt led the public astray!