In 1991, the Irish Lesbian & Gay Organization in NYC applied to march in the St. Patrick's Day Parade. They were refused. Instead, they marched with Mayor David Dinkins as guests of a local division of the Ancient Order of Hibernians (AOH.)
Spectators and other marchers showered ILGO, Mayor Dinkins and AOH Division 7 with abuse and a few projectiles. Mayor Dinkins compared the experience to walking in civil rights marches in Alabama. That's what you're seeing in this video.
In 1992, ILGO marched briefly on 5th Ave in a protest march and into a pen on the sidelines, where they were viciously heckled, also seen here.
In 1993, an AOH lawyer told a judge that the parade’s “message is one of exclusion,” and AOH representatives told a NY Times reporter that the parade would be “a celebration of the victory of Catholic values over homosexuals.”
In 1993, with their request to march once again refused, a mass civil disobedience took place with ILGO and supporters. Since 1992, the parade has been protested, and most Democratic politicians in NYC decline to march as long as the parade remains exclusionary.
As someone who witnessed first-hand this parade of bigotry in the early years, I wonder why uniformed officers of NYC are still marching.