Unabomber.
There are a lot of failures to: Underwear bomber, that SUV in times square back in 2010, the white supremacist in washington state etc.
I found this list of bombings prior to the ones already mentioned:
Nov. 7, 1983: A bomb blows a hole in a wall outside the Senate chamber at the Capitol in Washington. No one is hurt. Two leftist radicals plead guilty.
May 16, 1981: A bomb explodes in a men’s bathroom at the Pan Am terminal at New York’s Kennedy Airport, killing a man. A group calling itself the Puerto Rican Armed Resistance claims responsibility. No arrests are made.
Dec. 29, 1975: A bomb hidden in a locker explodes at the TWA terminal at New York’s LaGuardia Airport, killing 11 people and injuring 75. Palestinian, Puerto Rican and Croatian groups are suspected, but no arrests are made.
Jan. 29, 1975: The U.S. State Department building in Washington, D.C., is bombed by the Weather Underground. No one is killed.
Jan. 24, 1975: A bomb goes off at historic Fraunces Tavern in New York City, killing four people. It was one of 49 bombings attributed to the Puerto Rican nationalist group FALN between 1974 and 1977 in New York.
Jan. 27, 1972: A bomb wrecks the New York City office of impresario Sol Hurok, who had been booking Soviet artists. One person is killed and nine are injured, Hurok among them. A caller claiming to represent Soviet Jews claims responsibility, but no arrests are made.
March 1, 1971: The Senate wing of the U.S. Capitol Building in Washington, D.C., is bombed by the Weather Underground. No one is killed.
March 6, 1970: Three members of the revolutionary Weather Underground accidentally blow themselves up in their townhouse in New York City’s Greenwich Village while making bombs.
1951-56: George Metesky, a former Consolidated Edison employee with a grudge against the company, sets off a series of blasts at New York landmarks, including Grand Central station and Radio City Music Hall. No one is killed. Known as The Mad Bomber, Metesky spends 16 years in a mental hospital.
May 18, 1927: 45 people — 38 of them children — are killed when a school district treasurer, Andrew Kehoe, lines the Bath Consolidated School near Lansing, Mich., with hundreds of pounds of dynamite, and blows it up. Investigators say Kehoe, who also died in the blast, thought he would lose his farm because he couldn’t pay property taxes used to build the school.
Sept. 16, 1920: A bomb explodes in New York City’s Wall Street area, killing 40 and injuring hundreds. Authorities conclude it was the work of "anarchists" and come up with a list of suspects, but all flee to Russia.
Oct. 1, 1910: The Los Angeles Times building is dynamited during a labor dispute, killing 20 people. Two leaders of the ironworkers union plead guilty.
May 4, 1886: A bomb blast during a labor rally at Chicago’s Haymarket Square kills 11 people, including seven police officers, and injures more than 100. Eight "anarchists" are tried for inciting riot. Four are hanged, one commits suicide and three win pardons after seven years in prison.
