what team has lost finals after being up 3-1

The Chicago Stags lost in the 1947 NBA Finals against the Philadelphia Warriors, 4 games to 1.

	TEAM	SEASON	SERIES	GP	MPG	PPG	RPG	APG	FGM	FGA	FG%	FTM	FTA	FT%	TS%	TPG	MIN	PTS	REB	AST	TOV	PF
1	Stags	1946-47	NBA Finals	5	240.0	74.2			28.4			17.4	27.4	63.5			1,200	371				129
2	Warriors	1947-48	NBA Finals	6	240.0	73.8		6.3	22.5	90.7	24.8	28.8	37.3	77.2	34.5		1,440	443		38		155
3	Capitols	1948-49	NBA Finals	6	240.0	72.2			25.0			22.2	33.0	67.2			1,440	433				179
4	Nationals	1949-50	NBA Finals	6	240.0	80.2			27.8			24.5	34.8	70.3			1,440	481				168
5	Knicks	1950-51	NBA Finals	7	240.0	78.0	44.0	21.1	28.9	79.1	36.5	20.3	30.3	67.0	42.2		1,680	546	308	148		198
6	Knicks	1951-52	NBA Finals	7	247.1	79.4	41.1	14.6	26.1	70.1	37.3	27.1	36.6	74.2	46.1		1,730	556	288	102		178
7	Knicks	1952-53	NBA Finals	5	240.0	79.0			25.0	72.0	34.7	29.0	39.2	74.0	44.3		1,200	395				139
8	Nationals	1953-54	NBA Finals	7	240.0	70.7			23.6	61.9	38.1	23.6	37.9	62.3	45.0		1,680	495				167
9	Pistons	1954-55	NBA Finals	7	240.0	91.4			31.0			29.4	37.3	78.9			1,680	640				201
10	Pistons	1955-56	NBA Finals	5	240.0	93.4	58.4	21.8	32.6	89.2	36.5	28.2	37.4	75.4	44.2		1,200	467	292	109		113
11	Hawks	1956-57	NBA Finals	7	254.3	110.0	60.9	20.7	37.6	99.0	38.0	34.9	49.1	70.9	45.6		1,780	770	426	145		208
12	Celtics	1957-58	NBA Finals	6	240.0	110.7	65.5		36.0	101.3	35.5	38.7	49.7	77.9	44.9		1,440	664	393			194
13	Lakers	1958-59	NBA Finals	4	240.0	111.5	67.0	25.0	45.0	116.0	38.8	21.5	29.3	73.5	43.3		960	446	268	100		108
14	Hawks	1959-60	NBA Finals	7	240.0	105.3	57.7	24.7	40.6	96.6	42.0	24.1	32.3	74.8	47.5		1,680	737	404	173		162
15	Hawks	1960-61	NBA Finals	5	240.0	108.6	60.8	21.4	40.6	109.2	37.2	27.4	35.8	76.5	43.5		1,200	543	304	107		138
16	Lakers	1961-62	NBA Finals	7	243.6	113.6	58.0	19.3	39.7	97.1	40.9	34.1	42.4	80.5	49.0		1,705	795	406	135		181
17	Lakers	1962-63	NBA Finals	6	240.0	113.2	55.5	17.7	42.2	95.8	44.0	28.8	36.7	78.6	50.5		1,440	679	333	106		157
18	Warriors	1963-64	NBA Finals	5	240.0	101.2	61.8	17.6	37.6	96.4	39.0	26.0	42.2	61.6	44.0		1,200	506	309	88		133
19	Lakers	1964-65	NBA Finals	5	240.0	110.8	58.2	19.8	40.8	93.4	43.7	29.2	39.8	73.4	49.9		1,200	554	291	99		130
20	Lakers	1965-66	NBA Finals	7	243.6	114.6	52.9	21.0	43.1	97.6	44.2	28.3	37.9	74.7	50.2		1,705	802	370	147		180
21	Warriors	1966-67	NBA Finals	6	244.2	117.8	72.5	23.7	47.8	123.8	38.6	22.2	31.7	70.0	42.8		1,465	707	435	142		182
22	Lakers	1967-68	NBA Finals	6	244.2	114.5	56.8	22.7	45.3	99.2	45.7	23.8	34.0	70.1	50.2		1,465	687	341	136		158
23	Lakers	1968-69	NBA Finals	7	240.0	106.3	60.7	21.6	40.1	90.9	44.2	26.0	40.6	64.1	48.9		1,680	744	425	151		174
24	Lakers	1969-70	NBA Finals	7	247.1	111.4	53.6	26.4	43.1	87.3	49.4	25.1	36.6	68.8	53.9		1,730	780	375	185		150
25	Bullets	1970-71	NBA Finals	4	240.0	94.0	47.8	19.5	40.5	105.5	38.4	13.0	19.3	67.5	41.2	16.8	960	376	191	78	67	91