Their evidence led to a report commissioned by the World Anti-Doping Agency, which uncovered widespread doping in Russian athletics, and was followed by the McLaren report.
Rowing's world governing body FISA cut four Russian crews from the Olympic programme following drugs investigations leaving just six Russian athletes with the opportunity to form a men's four.
After the decision not to impose a general ban on Russian athletes from competing at the Olympics in Brazil, IOC President Thomas Bach has faced widespread criticism.
ROWING: Governing body FISA on Monday banned three of the 28 Russian rowers who have qualified.
The scandal, which centers on allegations that the Russian government and FSB security service have systematically covered up doping in sport, has hurt Putin's attempts to tie Russia's sporting prowess to what he says is his country's resurgence on the world stage, but his own ratings look safe.
The five include 2012 bronze medalist Alexei Korovashkov.
He also noted that the World-Anti Doping Agency has already tested each Russian wrestler at accredited laboratories - with some of those athletes having passed as many as four tests.
Harting says the IOC's decision is a set-back in the battle to drive doping from sport and says he "can't understand the decision" which he finds "simply embarrassing".
Under the measures, no Russian athletes who have ever had a doping violation will be allowed into the games, whether or not they have served a sanction, a rule that has not applied to athletes in other countries.
The remaining 17 entered rowers and two coxswains (besides the three rowers revealed yesterday) are not at all considered to have participated in doping, but do not meet the conditions established by the IOC in their decision of 24 July 2016 for participation in the Rio 2016 Olympic Games.
The legal framework for worldwide sports has been put to the test in the global Olympic Committee's ruling on Russia's eligibility for the 2016 Olympic Games, writes Tim Fuller. The decision, the Stepanovs claim, is based on incorrect information, including the IOC's framing of Stepanova's decision to become a whistleblower as a too-little-too-late desperation play made after the Russian team cast her aside.
On Sunday the International Olympic Committee decided against an outright ban on all Russian athletes, ignoring recommendations from Wada. Track and field, swimming and canoeing have so far said Russians will be banned.
"There will be athletes who have used doping from Russian Federation in Rio", Vitaly Stepanov told BBC Sport.
While each sport works out what to do about Russia, the umbrella group that represents their interests, the Association of Summer Olympic International Federations, fired an extraordinary broadside at those who have criticised the Olympic movement's handling of the crisis.
Weightlifting is the other sport most likely to issue a blanket ban on Russian competitors in Rio following a significant number of confirmed positive doping tests.
Russian archers have been targeted for additional testing, both in and out of competition, since the report was released, the federation said.