Rahul attacked the government over virtually everything that has gone wrong for the government in recent times.
Rahul said the people's money has gone into Nirav Modi's pocket, attacked Modi over the Rafale deal, BJP President Amit Shah over the alleged sudden increase in his son's income, and accused the government of interfering in the judiciary.
He also spoke of farmer debt and the recent rapes in Kathua in Jammu and Kashmir and Unnao in Uttar Pradesh that have rattled the country.
The rally at Delhi's Ramlila Maidan is currently underway.
The Congress helped unite the country over the last 70 years, said Rahul. This government however, he added, is spreading lies and hate.
The minorities everywhere are being attacked but PM Modi does not bother to respond to such incidents, said Rahul.
He added that that unemployment has reached peak levels, and that demonetisation and the "Gabbar Singh" Tax (GST) have hurt the national economy.
Rahul added that when PM Modi speaks, people have to search hard for shreds of truth within his speeches.
The Congress President that everywhere he travelled in the country, he asked people if they were happy with the government at the centre. And that the answer was a resounding "no".
Rahul added that the Congress will emerge victorious in the upcoming Karnataka, Rajasthan, Madhya Pradesh and Chhattisgarh assembly polls, as also in the 2019 general polls.
Sonia Gandhi spoke before Rahul, saying corruption had increased under Prime Minister Narendra Modi.
"Modi ji had said 'na khaunga na khane dunga' but corruption has increased," she said.
"Aaj desh mein asatya aur anyay ka bolbala hai. Whoever raises (their) voice has to bear the brunt of Modi government's anger," she added.
Former prime minister Manmohan Singh also addressed the rally, saying, "Our democratic institutions are under attack. Parliament is not being allowed to function and legislation is being bulldozed."
"Our democracy is in danger and we must all work together to protect it," he added.
The "Jan Akrosh Rally" comes shortly ahead of the crucial Karnataka elections to be held on May 12.