Beginning in the 1960s, Wicker Park began to change radically. Completion of the Kennedy Expressway in 1960, whose construction had displaced many residents and torn holes in the sustaining network of Polish-American churches, settlement houses, and neighborhood groups. Additionally Puerto Ricans and other Latinos displaced by urban renewal in Old Town and Lincoln Park began moving in. In 1960 Latinos comprised less than 1 percent of West Town's population, but by 1970 that number was up to 39 percent. Split from the Lincoln Park neighborhood only by the Kennedy Expressway in the late 1950s and 1960s, it contained the second-largest concentration of Puerto Ricans in Chicago. It was the original home to the largest Latino gang at the time, the Latin Kings. The Young Lords, a human rights movement, held sit-ins with L.A.D.O. at the Wicker Park Welfare Office and large nonviolent marches to city hall. Urban renewal projects were undertaken to combat "urban blight" in some parts of the neighborhood, but disinvestment continued at a rapid clip as downtown banks redlined West Town for much of the mid-20th century. Wicker Park was also promoted by the city's urban renewal plans, as a good "suburb within the city" because of its easy access to downtown, via Milwaukee and the elevated train (via Damen and Division stations). Chicago and Wicker Park reached a nadir in the 1970s, a decade when the city overall lost 11% of its population. During the 1970s, hundreds of cases of insurance-motivated arson were reported in Wicker Park, near St. Elizabeth Hospital. Many small factories near the area (many in woodworking) also closed or moved away.