By 3 April 1700, Bach and his schoolfriend Georg Erdmann—who was two years Bach's elder—were enrolled in the prestigious St. Michael's School in Lüneburg, some two weeks' travel north of Ohrdruf.
At the 11th Party Congress in 1922, Lenin nominated Stalin as the party's new General Secretary. Although concerns were expressed that adopting this new post on top of his others would overstretch his workload and give him too much power, Stalin was appointed to the position.
On April 3, Luciano was arrested in Hot Springs on a criminal warrant from New York. The next day in New York, Dewey indicted Luciano and his accomplices on 60 counts of compulsory prostitution. Luciano's lawyers in Arkansas then began a fierce legal battle against extradition.
Soon after the success of the Cuban Revolution, militant counter-revolutionary groups developed in an attempt to overthrow the new regime. Undertaking armed attacks against government forces. On 3 April 1961, a bomb attack on militia barracks in Bayamo killed four militia, and wounded eight more.
On April 3, 1973, Martin Cooper, a Motorola researcher and executive, made the first mobile telephone call from handheld subscriber equipment, placing a call to Dr. Joel S. Engel of Bell Labs, his rival. The prototype handheld phone used by Dr. Cooper weighed 1.1 kilograms (2.4 lb) and measured 23 by 13 by 4.5 centimetres (9.1 by 5.1 by 1.8 in). The prototype offered a talk time of just 30 minutes and took 10 hours to re-charge.
The Iraqi Air Force, badly damaged by the Iranians, was moved to the H-3 Airbase in Western Iraq, near the Jordanian border and away from Iran. However, on 3 April 1981, the Iranian air force used eight F-4 Phantom fighter bombers, four F-14 Tomcats, three Boeing 707 refuelling tankers, and one Boeing 747 command plane to launch a surprise attack on H3, destroying 27–50 Iraqi fighter jets and bombers.
On the evening of 3 April, the United Kingdom's United Nations ambassador Sir Anthony Parsons put a draft resolution to the United Nations Security Council.
In the 2005 regional elections (3 April/4 April 2005), centre-left candidates the for regional presidencies won in 12 out of 14 regions where control of local governments and presidencies were at stake. Berlusconi's coalition held only two of the regions (Lombardy and Veneto) up for re-election. Three parties, Union of Christian and Centre Democrats, National Alliance and New Italian Socialist Party, threatened to withdraw from the Berlusconi government.
On April 3, at WrestleMania XXVII, The Rock opened the show by cutting a promo. After appearing in numerous backstage segments, The Rock came to ringside to restart the main event between Cena and The Miz as a No Disqualification match, after it had ended in a draw. As revenge for the Attitude Adjustment Cena had given him on Raw, Rock hit Cena with the Rock Bottom, allowing The Miz to pin him and retain the WWE Championship.
Privately, he wanted to start, but kept it to himself. O'Neal missed games throughout the season due to an assortment of ailments to his right leg including knee, calf, hip, and Achilles injuries. The Celtics traded away center Kendrick Perkins in February partially due to the expectation that O'Neal would return to fill Perkins' role. The Celtics were 33–10 in games Perkins had missed during the year due to injury, and they were 19–3 in games that O'Neal played over 20 minutes. After requesting a cortisone shot, O'Neal returned April 3 after missing 27 games due to his Achilles; he played only five minutes due to a strained right calf. It was the last regular season game he would play that year.
The Rock appeared at WrestleMania 32 where he announced that WWE had broken the all-time WrestleMania attendance record before being interrupted by The Wyatt Family. The Rock got into a verbal back-and-forth with Bray Wyatt before having an impromptu match with Wyatt Family member Erick Rowan. The Rock won after giving Rowan a Rock Bottom and pinning him in six seconds, which set the record for the fastest win in WrestleMania history.
On April 3, 2019, the House Ways and Means Committee made a formal request to the Internal Revenue Service for Trump's personal and business tax returns from 2013 to 2018, setting a deadline of April 10. That day, Treasury secretary Steven Mnuchin said the deadline would not be met, and the deadline was extended to April 23, which also was not honored, and on May 6 Mnuchin said the request would be denied. On May 10, 2019, committee chairman Richard Neal subpoenaed the Treasury Department and the IRS for the returns and seven days later the subpoenas were defied. A fall 2018 draft IRS legal memo asserted that Trump must provide his tax returns to Congress unless he invokes executive privilege, contradicting the administration's justification for defying the earlier subpoena. Mnuchin asserted the memo actually addressed a different matter.
On 3 April, the Chinese government declared 4 April, the Qingming Festival of 2020, a national day of mourning for those who lost their lives in the coronavirus pandemic. At 10 a.m., people were asked to observe three minutes of silence while sirens and vehicle horns blasted out. Chinese flags were flown at half-mast across the country and at embassies overseas. All public entertainment was halted for the day.